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Season 4
1. Small Victories
Thor's Ship has been destroyed in an uncontrolled reentry through Earth's atmosphere, crashing into the Pacific Ocean, and taking the Replicators and the Stargate with it. The beta Stargate is established at the SGC, allowing SG-1 to return home, but they are met with disturbing news. At least one of the Replicators has survived, and has found it's way to a Russian submarine, killing everyone on board, and replicating at an alarming rate. O'Neill suggests destroying the sub with nuclear weapons, but the Pentagon faces a delicate diplomatic situation with the Russians.
Hoping to avoid an international incident, O'Neill and Teal'c lead a small combat team to face the deadly bugs aboard the submarine and to eliminate the threat to Earth. Their conventional weapons have a limited effect against the enemy, especially against the original Replicator, which has mutated into an enormous and nearly indestructible "mother bug". Destruction of the submarine is the only solution, and O'Neill and Teal'c find themselves trapped aboard the sub as they plant the explosives and desperately try to find means of escape before the sub is destroyed.
Meanwhile, the Asgard also face defeat by the Replicators in their home galaxy. Thor arrives at the SGC, hoping that the "less sophisticated" human approach may lead to the solution that eludes the Asgard. Carter's human knowledge provides a clever deception, using the Asgard's premiere ship, the "O'Neill", to lure the Replicators to their destruction. For now, both Earth and the Asgard are spared, but these are only small victories, and the Replicator threat remains.
2. The Other Side
An unexpected offworld transmission reaches the SGC from Alar, leader of the planet Euronda. The Eurondans are kindred of Earth, but their planet is devestated by war, and they are on the verge of annihilation. Desperate to save his people, Alar offers advanced Eurondan technology in return for aid from Earth, and SG-1 travels to the planet on a diplomatic mission to negotiate an agreement. There they find a desperate people, living for generations in a maze of underground bunkers from which they are fighting a losing battle against an unseen Enemy on the surface.
The Eurondans are a technologically advanced people, and they have much to offer Earth. Their nuclear fusion reactors, advanced weapons systems, and medicine are far ahead of anything on Earth, and they are willing to share all of it in exchange for humanitarian aid and a supply of heavy water which will power their generators. O'Neill willingly agrees to the exchange, but Daniel is suspicious of the Eurondan agenda, and confronts O'Neill with his doubts. Clues begin to suggest that the Eurondans are concealing something.
An investigation reveals disturbing information. The unseen Enemy is the focus of Eurondan hatred because they reproduce with no regard for genetic purity. The Eurondans themselves were the aggressors who initiated the war by deliberately poisoning the planet's surface in an attempt at racial genocide. Horrified by their discovery, SG-1 turns against the Eurondans and retracts their agreement. As the defense shields begin to crumble, they depart through the Stargate, leaving the dying Eurondans to their fate.
3. Upgrades
Amoung the ruins of the distant homeworld of the Ataniks, the Tok'ra have discovered unusual armbands that are purported to give the wearer amazing powers. However, the presence of a symbiote renders the armbands ineffective and useless to the Tok'ra. Anise, an expert in ancient cultures, and a new Tok'ra representative to Earth, approaches the SGC, seeking human test subjects. The mysterious devices could be a powerful new weapon in the war against the Goa'uld, and O'Neill, Carter, and Daniel volunteer to test them.
Once fitted with the alien armbands, O'Neill, Carter, and Daniel begin experiencing dramatic changes. They are endowed with incredible speed and strength, and reveal in their newfound abilities despite Dr. Fraiser's concerns. The devices rely on a virus which increases metabolism and presents a serious health risk, but even more unsettling, they cannot be removed. They also affect judgement, and the three find themselves defying orders and leaving the base, even becoming involved in an altercation in town, despite being confined to quarters.
As Dr. Fraiser searches for a solution, O'Neill, Carter, and Daniel are anxious to put their new abilities to the test. When Anise beings word that Apophis is building a new class of battleship that could ensure his dominance over the Goa'uld, they see their oppourtunity. Again they defy orders and travel through the Stargate to sabotage the new ship. During the mission, however, the devices fail, and in their weakened state, SG-1 barely escapes with Teal'c's help as the enemy ship is destroyed.
4. Crossroads
Shan'auc, a Jaffa priestess of Chulak, is sent to the SGC on behalf of Bra'tac. She brings important news, and explains that she believes she has found a way to communicate with her symbiote. In a deep state of kelno'reem, she and her symbiote have shared images and feelings, and she is convinced that she has turned it against the evil ways of the Goa'uld. Her symbiote is willing to share all it's knowledge with the Tok'ra, and Shan'auc has come seeking the SGC's help to find a willing Tok'ra host.
Teal'c is skeptical of Shan'auc's claims. Howeverm Shan'auc is an old acquaintance, someone he has known for many years on Chulak, and the two of them still share affection for one another. Teal'c attempts to test her theory by entering a deep state of kelno'reem, and he, too, shares primitive images with his own symbiote, images of evil and the death of his own father at the hands of Cronus. Convinced that Shan'auc may indeed have found a new way to defeat the Goa'uld, Teal'c promises his support.
The Tok'ra agree to help Shan'auc, and a willing host is found for her symbiote. The transference takes place, and the symbiote, Tanith pledges his allegiance to the Tok'ra. However, once Tanith has taken a host, his deception becomes clear. Shan'auc is found murdered at Tanith's hands, and Teal'c vows revenge. Returning to Vorash to confront Tanith, SG-1 demands justice, but the Tok'ra have a different solution. They see the value in protecting Tanith, and using him instead as an unwitting counterspy.
5. Divide and Conquer
SG-1 and SG-14 are on Vorash preparing to sign a treaty of alliance between Earth and the Tok'ra, when Major Graham, of SG-14, suddenly begins firing a weapon uncontrollably before taking his own life. Anise determines that Graham was a Zatarc, a victim of a new kind of Goa'uld mind control technology. Zatarcs are programmed as suicide assassins, and their programming is covered by false memories. Only new and unproven Tok'ra technolgy is able to detect Zatarc programming, of which even the victim is unaware, and Anise brings the device to Earth to test members of the SGC.
Anise begins her testing procedure, and Lt Ashtor, another member of SG-14, is also identified as a Zatarc. However, an attempt to reverse her programming causes her to lose control and take her own life. More troubling still, the device determines that both O'Neill and Carter may also be victims. With the signing of the treaty imminent, O'Neill and Carter are faced with the choice of indefinite sedarion and confinement as possible security threats, or submitting to the same risky deprogramming technique that led to Astor's death. O'Neill agrees to the experimental procedure.
As O'Neill prepares for the dangerous deprogramming, Carter realizes the flaw in the Zatarc technology. The device can misread emotions, interpreting omissions as lies, and giving a false reading. O'Neill and Carter are retested, admitting feelings they had previously concealed, and they are cleared as Zatarcs. It is not until the real Zatarc attempts to assassinate the Earth and Tok'ra leaders that his identity is discovered. It was Martouf who was the unknowing victim of Zatarc programming, and who dies as he attempts to carry out his suicide mission.
6. Window of Opportunity
On p4x-639, SG-1 meets Malikai, an explorer from another world studying the planet's ruins, including an ancient alien computer that seems to hold the key to the planet's mysteries. The computer draws it's power from geomagnetic storms caused by increased solar activity, and as Malikai begins to activate the device, O'Neill and Teal'c are caught with him in a strange blue energy field. Suddenly, O'Neill finds himself back at the SGC, ten hours earlier, eating breakfast, and preparing for the mission to P4X-639 from which he has suddenly returned.
No one can explain why O'Neill and Teal'c insist that events are repeating themselves, but when the phenomenon occurs again, and again, it becomes apparent that all of the SGC is caught in a time loop. Time after time, O'Neill returns to the same bowl of Fruit Loops as the previous ten hours are repeated, but only O'Neill and Teal'c retain any memory of the previous loops. First they must convince the other members of the SGC that the time loop is real, and then they must find a way to decipher the alien device in order to break the cycle.
The writing on the device holds the answers. Built by a colony of the Ancients as means of time travel to save their dying world, the device had never worked. However, Malikai is convinced that he will find the solution that eluded the Ancients, enabling him to travel back in time to be reunited with his deceased wife. SG-1 must convince him to accept the inevitable, to abandon his quest and deactivate the machine, thus releasing thirteen worlds from an endless loop in time.
7. Watergate
The Stargate won't engage, and an investigation leads to the discovery of a second Stargate in Siberia. The Russians had recovered the alpha gate from the floor of the Pacific following the destruction of Thor's Asgard ship, and had begun their own Stargate program. Now, however, the Russian gate is locked open, inexplicably maintaining a perpetual wormhole to a planet submerged in water. Brilliant Russian scientist, Dr. Svetlana Markov, turns to the SGC for help, and SG-1 travels to Siberia in an attempt to shut down the gate.
At the Siberian facility, SG-1 makes a horrifying discovery. All of the soldiers and scientists are found dead. A sample of the water, which had been retreived from the planet and found to have the amazing ability to emit energy, is missing, and the gate remains connected to the water planet, apparently drawing it's power from the water itself. Dr. Marcov, Carter, and Daniel travel through the wormhole in a miniture submarine, and are successful in shutting down the gate, but the water prevents the sub's return, and begins to crush it.
Meanwhile, back at the facility, O'Neill and Teal'c discover the frozen body of Colonel Maybourne locked in a freezer. Even more astounding, as the body begins to thaw, Maybourne comes back to life, coughing up water, and bringing a dire warning. The water is alive. Having left Maybourne, the water enters Teal'c and forces him to dial the Stargate. Now able to return to the planet, the water vanishes through the gate, just as Dr. Marcov, Carter and Daniel are returned to the facility in what appears to be an improbable exchange of hostages.
8. The First Ones
During an archaeological dig with SG-11 on P3X-888, Daniel Jackson and his associate Robert Rothman discover remains of an ancient predatory Goa'uld symbiote. The planet is the original home world of the primordial Goa'uld and the aboriginal Unas race they eventually took as hosts. Suddenly, an Unas enter the dig site and attacks the team, capturing Daniel and dragging him deep into the wilderness. Rothman brings word back to the SGC, and O'Neill heads a joint rescue mission to the planet.
The rescue team arrives to find that only Major Hawkin of SG-11 has survived, and the primitive Unas are not the planets only threat. The rivers are teeming with Goa'uld symbiotes, and the team fears that any one of them could have been secretly taken as a Goa'uld host. Unknown to them, their fears are justified, and in fact two of them have already been victims of the Goa'uld. Both Hawkins and Rothman have unwittingly become hosts, and both are killed when they turn against the other team members.
Meanwhile, Daniel is dragged further into the wilderness. As he struggles to communicate with his captor in the creature's primitive language, he come to understand that the young Unas, name Chaka, has captured him as part of a right of passage. Slowly they begin to form the bonds of understanding and trust as Daniel tries to negotiate for his freedom. When the rescue team finally reaches Daniel, they witness a confromtation between Chaka and the Unas leader, a battle in which Chaka protects Daniel, and finally allowed him to go free.
9. Scorched Earth
The Enkarans had been captured from their home world and enslaved by the Goa'uld long ago, but thanks to SG-1, the race has been transplaneted to a new planet. P5S-381 is a new and safer world, unique in that it provides precisely the environmental conditions and protection from radiation that the Enkaran physiology requires. However, as the Enkarans prepare to celebrate the rebirth of their civilisation on their new home world, a mysterious ship appears on the horizon and begins to systematically destroy the landscape.
SG-1 investigates, and meets Lotan, a bio-mechanical liaison created by the ship, who explains that the ship has no hostile intent. The ship belongs to the Gadmeer, an advanced but long dormant alien species which had been conquered by a powerful enemy and which only seeks a new world. The Gadmeer physiology is based on sulfur, and the ship is merely terraforming the planet. Once the process has begun, it must be completed, or the Gadmeer will face extinction. However, the Enkarans cannot be relocated in time, and to stay would mean their own certain death.
Faced with choosing extinction for an entire race, SG-1 must struggle with and ethical dilemma. O'Neill makes the difficult decision to destroy the ship, and orders Carter to program a naquadah bomb. Before his plan can be completed, however, Lotan diverts the bomb, then makes a promising discovery. The ship's computers locate the original Enkaran home world, long since forgotten, and Lotan offers a compromise. If the ship transports the Enkarans to their ancestral home before the terraforming is complete, both races will have a chance to survive.
10. Beneath the Surface
SG-1 awakens in a mysterious facility on P3R-118 with no memory of their former lives. A memory stamp procedure has given them new identities. No longer O'Neill, Carter, Daniel, and Teal'c, they are now Jonah, Therra, Carlin, and Tor. Unaware of the prosperous domed city above them on the surface, they are doomed to live a dreary existence as workers within a massive underground complex providing energy for a planet in the midst of an ice age.
At the SGC, General Hammond attempts to solve the mystery of his team's disappearance. He refuses to accept the possibility that they could have perished on the planet's icy surface, but repeated rescue missions turn up no sign of SG-1. On the planet, it is Administratot Calder who is determined to prevent a rescue. Outraged by SG-1's criticism of the slave labor used on the planet, it is his intent to entrap the team in the very system they condemned. Brenna, the supervisor of the workers, questions his decision, but she is powerless to help on her own.
The memory stamp is not permanent, and slowly SG-1 begins to experience vaque and fleeting glimpses of memories hidden just beneath the surface, memories that convince them that they don't belong there. As their work within the underground facility earns them Brenna's respect, the fleeting glimpses become more pronounced, and the gradual recall of their identities begins to threaten Calder's plans. Brenna offers them a mean of escape, and in over-throwing Calder, SG-1 reveals the surface city to the worker's below, offering them freedom from their harsh existence.
11. Point Of No Return
The SGC is contacted by a conspiracy theorist who claims he has full knowledge of a host of government cover-ups, including the Stargate program. O'Neill arranges a meeting and travels to Billins, Montana, where he finds Martin Lloyd, a meek and hapless character who explains he us not only interested in outer space, he is from outer space. Martin insists he is an alien who came to Earth in his spaceship, and now only wants to return home through the Stargate.
O'Neill is prepared to dismiss Martin as a harmless eccentric, but suspicious circumstances raise more questions. Carter and Daniel, investigating Martin's background, learn that his medication is affecting his memory, and that there are four other men who are also anxious to locate Martin. When Carter and Daniel disappear altogether, and Martin presents O'Neill with a set of gate coordinates, O'Neill begins to take him seriously. As Martin leads O'Neill and Teal'c to his buried spaceship, it becomes apparent that there just may be some truth to his story.
Martin's gate coordinates may hold the key, and a trip through the Stargate reveals a deserted and devastated planet. As Martin's memory returns, he recalls his home world before it was destroyed by the Goa'uld. He and his comrades had been sent to find allies in defense of their planet, but realizing they were losing the war, they had abandoned their ship on Earth, and had gone into hiding. Now with no place else to go, Martin returns to Earth, where he and his missing comrades continue to live in secret.
12. Tangent
The SGC develops the X-301 Intercept, and experimental hybrid craft made from two captured Goa'uld death gliders. However, during it's test flight, a hidden Goa'uld device causes O'Neill and Teal'c to lose control of the craft, and sends them hurtling into space. Carter and the SGC desperately try to find a way to return the ship to Earth, but when an attempt to slingshot around Jupiter fails, and the craft is further damaged in a collision, the situation looks hopeless.
Daniel tries to contact offworld allies for help, and learns that the Tok'ra have a single ship within range, but it is engaged in a covert mission in Goa'uld territory. Carter and Daniel gate to that region of space, hoping to intercept the Tok'ra ship, and are suprised to discover that the Tok'ra operative they are seeking is Jacob Carter. When Jacob learns of the situation, he abandons his mission, and with his help, Carter and Daniel race across the galaxy, hoping to reach O'Neill and Teal'c before it's too late.
As the X-301 streaks towards the edge of the solar system, O'Neill and Teal'c try to conserve their resources in the faint hope of a rescue. Jacob's ship is barely able to rendezvous with the disabled craft in time, but O'Neill and Teal'c are already suffering from oxygnen deprivation and the deep cold of space, and are barely conscious. With only moments of oxygen remaining, they coordinate a daring rescue. O'Neill and Teal'c must enter the emptiness of space in order to be transported aboard the safety of the Tok'ra ship.
13. The Curse
Daniel returns to his alma mater when he learns of the death of his former archaeology professor in a mysterious lab explosion. There he is reunited with his former colleagues, Sarah Gardner, with whom he once shared a relationship, and Steven Rayner, who resents his return. The professor had been studying a collection of Egyptian artifacts, but the circumstances of his death are suspicious. The explosion may not have been an accident, and rumors of an ancient curse begin to spread.
Daniel and Sarah begin an investigation, despite Steven's resistance. The artifacts had included two identical jars, and Daniel discovers that one of them contains the dead symbiote of Isis. Designed as a stasis chamber, the jar had kept the Goa'uld alive until the seal had recently been broken. However, the second jar containing Osiris is missing, and the Goa'uld is unaccounted for. When two more deaths occur on campus and another artifact turns up missing, suspicion begins to point toward Steven, who has boarded a flight to Cairo.
Daniel, Carter, and Dr. Fraiser follow Steven to Egypt, to the temple where the artifacts were found. Hoping to claim the discovery in the temple, Steven had arrived before them. However, they find him badly injured, and they learn the true fate of the missing Goa'uld. Osiris had indeed survived, and it was Sarah Gardner whom he had taken as a host. He appears at the temple, demanding obedience, and the location of the Stargate, but when his demands go unanswered, he vows vengence before uncovering a buried ship and escaping from Earth.
14. The Serpent's Venom
While visiting Chulak to raise support for the Jaffa rebellion, Teal'c is betrayed by Rak'nor, a fellow Jaffa, and is captured by the Goa'uld. He is imprisoned on a ship belonging to Heru'ur, but despite repeated torture, he remains defiant, refusing to retract his condemnation of false gods. Meanwhile, unaware of his fate, the rest of SG-1 joins Jacob Carter in an attempt to thwart an alliance between Apophis and Heru'ur. As the two most powerful System Lords, an alliance between them could topple the balance of power among the Goa'uld.
The meeting is to be held in neutral territory, an ancient floating minefield orbiting the Tobin system, and SG-1 plans to sabotage the negotiations. Carter and Daniel attempt the delicate procedure of capturing and reprogramming one of the mines to recognize the energy signal of Apophis's ship. When released from the cloaked cargo vessel, the mine will target Apophis, who, believing Heru'ur to be responsible for the treachery, will return fire. All is in place when Heru'ur reveals that he has brought along an offering to Apophis to seal their agreement, a beaten but determined Teal'c.
SG-1 is faced with the horrifying choice of completing their mission, or saving their friend. An attempt to rescue Teal'c by intercepting the matter stream between ships fails, but Teal'c has found another unlikely ally. Witnessing Teal'c's strength, Rak'nor has a change of heart, and helps Teal'c to escape in a death glider, just as the programmed mine targets Apophis's ship. However, Apophis reveals a suprise of his own, an entire cloaked fleet, which materializes and overpowers Heru'ur's forces, making Apophis an even more formidable threat.
15. Chain Reaction
General Hammond abruptly resigns from the SGC, and is replaced by General Bauer, who promptly dismantles SG-1, reassigning the team members and placing O'Neill on temporary leave. O'Neill suspects that there is more to Hammond's sudden decision than he is saying, and an investigation reveals that he is right. Powers within the NID were behind the change of command, resorting to blackmail to remove Hammond, in order to force a more aggressive approach toward acquiring alien technology.
General Bauer's first project is to assign Carter the task of building a naquadah-enhanced nuclear weapon. Despite her warnings of the devastating chain reaction such a device could cause, a prototype is developed and tested off world. The destructive power is enormous, and begins to translate back through the gate, posing a threat to Earth, until the gate can finally be disengaged. Meanwhile, O'Neill begins an investigation into the powers behind the NID, and he turns for help to an unlikely source: Colonel Maybourne, who has been serving time in prison for treason.
In exchange for temporary release from prison, Maybourne agrees to use his contacts to assist O'Neill. Their investigation through a covert chain of command leads to Senator Kinsey and the very highest echelons of political power. A confrontation with Kinsey reveals only the tip of the iceberg of a conspiracy that reaches far beyond the NID itself. However, the evidence they uncover from Kinsey's own computer sets the wheels in motion to restore Hammond's command, and also provides Maybourne with an opportunity to guarantee his freedom.
16. 2010
The year is 2010. Ten years ago, Earth allied itself with the Aschen, an advanced and benevolent race which has cured disease, extended life expectancy, and ensured Earth's safety by defeating the Goa'uld. No longer a secret government program, the SGC has been closed down, O'Neill has retired to Minnesota, and the Stargate is now used routinely for civilian travel. The Aschen have freely shared their technology, and have won the gratitude and respect of all humanity.
As Earth prepares to celebrate it's tenth anniversary as members of the Aschen Confederation, Carter discovers that she and her husband Joe are unable to conceive a child. Her Aschen doctors assure her nothing is amiss, but Dr. Fraiser's examination reveals that the Aschen have been lying, and their own medical practices may be the cause of her condition. Further investigation uncovers the sinister truth. The Ashcen medical advances have eliminated population growth and the human race is facing extinction. With the Aschen holding reigns of power, there is no way to reverse their insidious plan.
Earth's only hope lies in the past, and SG-1 reunites from it's retirement to carry out a daring plan. Using Aschen computers to predict the solar flares that could allow Stargate travel through time, SG-1 intends to brave the deadly security system protecting the gate to send a message ten years into the past, in order to prevent the Aschen alliance from ever happening. As each team member dies in the attempt to reach the gate, a note of warning is passed through the wormhole. Ten years earlier, the mysterious message flutters through the gate at the SGC.
17. Absolute Power
On Abydos, SG-1 encounters a whirling sandstorm that seems to whisper Daniel's name, then dissolves to reveal a young boy. The boy is Shifu, the Harsesis child of Sha're and Apophis, who has been raised by Oma Desala, and now seeks to learn about his own mother. Shifu is wise beyond his years, and he possesses the genetic knowledge of the Goa'uld, which could prove a valuable weapon against the System Lords. SG-1 returns with him to Earth, but once there, Shifu's touch causes Daniel to pass out. "Dreams Teach", he explains. "I'm teaching hi."
Through the power of Shifu's touch, Daniel comes to see the mysteries of the Goa'uld, the means for new technology, and the designs for weapon of mass destruction. Such weapons could benefit Earth, and Daniel oversees a plan to construct an elaborate orbiting network of enormous power. However, as Daniel's influence increases, so does his mistrust and alienation. Even Carter and O'Neill begin to question his motivation, and try to find a way to stop him as he uses his knowledge to bring the world to the brink of destruction.
As Daniel awakens, he comes to realize the danger of absolute power, and to understand Shifu's warning that when confronted with great evil, "the only way to win is to deny it battle." It is Shifu's wisdom, not his knowledge, that Daniel has gained in his dream. His spiritual journey complete, Daniel must convince the others that Shifu is not the key to a military victory over the Goa'uld. Having accomplished his mission, Shifu ascends to his etheral state, and departs once again through the Stargate.
18. The Light
When Daniel and SG-5 visit P4X-347, they return to Earth experiencing severe physical and emotional symptoms. Lieutenant Barber commits suicide, and Daniel and the others fall into a deep debilitating depression that leaves them near death. SG-1 investigates the planet and finds a strange Goa'uld temple containing a beautifully mesmerizing light, and the planet's only inhabitant, a young boy named Loran. The light is strangely compelling, and as SG-1 are drawn to it, they begin to lose all sense of time. Yet it's purpose, and it's effects, remain a mystery.
When O'Neill returns to Earth, he too begins experiencing the symptoms of depression, and tests reveal that a chemical imbalance is the cause. The members of SG-5 have died, and Daniel has slipped into a coma, moments from death. The answer appears to lie with the enigmatic light, and desperate to save Daniel's life, O'Neill carries him back through the gate to P4X-347. Once there, both men begin to recover, and it becomes apparent that proximity to the light's radiation causes euphoric highs, while distance results in critical withdrawal and death, SG-1 is trapped on the planet.
Young Loran holds the key. Long since deserted, the temple on P4X-347 had once been a Goa'uld pleasure palace, and Loran's parents had been explorers who had come to the planet and fallen victim to the powerful addiction of the light. Only by avoiding the light had Loran eluded it's irresistible hold. There is no escape, however Carter discovers that the intensity of the light can be adjusted. Time will provide the solution. As the light's effects gradually diminish, SG-1 and Loran will be able to safely return to Earth.
19. Prodigy
While lecturing at the Air Force Academy, Carter meets Jennifer Hailey, a young cadet. Hailey is a brilliant student, but she is also opinionated, resentful, and rebellious, and a confrontation with an upperclassman nearly results in her exclusion from the Academy. Major Carter, however, recognizes her brilliance and her potential to become a genuine asset to the SGC, and is determined the give her a taste of what her future could hold. She arranges for Cadet Hailey to join SG-1's mission to M4C-862, a moon orbiting a gas giant.
On M4C-862, Carter and Hailey join O'Neill and Teal'c, who have been providing security for a team of scientists at an offworld research base. The peaceful moon appears to have no indigenous threat, and the scientists resend the interference of the military, especially when they encounter an alien life form composed of pure energy. The tiny flying beings appear as small glowing lights and are entirely benign during the first encounter, but after one of them is captured, hundreds more attack the team, a threat made far more dangerous by their ability to pass through solid objects.
Cut off from the Stargate and surrounded by beings able to penetrate the walls of their research station, the team struggles to determine the reason for the creatures aggressive behavior and to find a means of escape. A makeshift electromagnetic field is their only protection against the glowing creatures, and O'Neill must rely on the residual charge from a zat gun and the energy field of the Stargate itself, in a race to the gate that will secure a way home for the team.
20. Entity
The MALP sent to P9C-372 is returning peculiar transmissions when suddenly a bolt of energy is sent back through the gate, shorting out the controls and the base computers. When the systems are online again, it is discovered that the unexpected energy was an alien probe which has infiltrated the computers and is accessing sensitive data. It is successfully eliminated from the mainframe, only to transfer itself into the MALP room where it begins building itself an electrical "nest" in which to expand and contain the immense amount of data it is accumulating
O'Neill wants to destroy the nest, but Carter and Daniel believe that the probe exhibits the intelligence of a living entity, and they want to try to communicate with it. However, as Carter attempts communication, she is overcome by the probe's energy, and the entity takes over her body instead. Attempts to negotiate with the entity for the release of Carter's body fail. The entity explains that Earth's MALP had been lethal to it's world, and now it has come to the SGC in order to destroy Earth in retaliation.
With the SGC and all of Earth facing annihilation, O'Neill must make the traumatic decision to kill Carter in order the stop the entity. However, as the teams mourns Carter's death and prepares to eliminate the alien nest in the MALP room, an enigmatic message appears on the computer monitors: "I am here". Carter's consciousness lives on in the entity's nest, transferred there by the entity before it's destruction. There is still a chance that an untried procedure will successfully return Carter to her own body.
21. Double Jeaopardy
SG-1's robot duplicates from Altair arrive on Juna, only to find that SG-1 had preceded them there, and the inhabitants have mistaken them for their human counterparts. Earlier, SG-1 had helped the people of Juna to overthrow Heru'ur, but now Cronus has arrived in his ship and claimed the planet instead. The duplicate Carter, Daniel, and Teal'c are captured, and Daniel is destroyed, revealing to the astonished Goa'uld that the team is not human. O'Neill hopes to rescue his team, but he finds little support from the people of Juna who are unwilling to face another rebellion.
Meanwhile, Harlan of Altair arrives at the SGC, pleading for SG-1's help. The duplicate team, he explains, has been going on missions, however they are long overdue from their mission to Juna, and are dangerously near the limit of their portable power packs. SG-1 feels a sense of responsibility toward the people of Juna whom they had once liberated, only to be conquered again, and so they reluctantly agree to return to the planet in order to face the forces of Cronus and set things right once more.
On Juna, SG-1 meets up with the duplicate O'Neill, who is also in contact with his team members being held prisoner by Cronus. Together, the two teams orchestrate an elaborate plan to defeat the Goa'uld forces. As the duplicate O'Neill and Carter provide cover, and Teal'c faces Cronus, each of the robot doubles gives his life in the deadly battle, but it is through their sacrifice that SG-1 succeeds in killing Cronus, capturing his pyramid ship, and freeing the planet once again.
22. Exodus
Now in possession of Cronus's pyramid ship, SG-1 travels to Vorash where they plan to lend the Goa'uld vessel to their Tok'ra allies in order to help them relocate to a new and safer homeworld. Tanith, now revealed as a traitor and a spy, is to be removed from his host and left behind, but before he can be dealt with, he escapes to the planet's surface, and signals Apophis. With Apophis's fleet approaching Vorash, SG-1 must find an alternative plan to evacuate the Tok'ra via the Stargate and use their Goa'uld ship to destroy their enemy.
Carter and Jacob devise a plan in which the Tok'ra Stargate will be connected to a black hole and jettisoned toward the sun in an attempt to cause a supernova and wipe out the entire solar system, taking Apophis's fleet with it. The gate is dialed and released, but before the plan can be completed, a Goa'uld fighter craft decloaks and attacks their ship, crippling them. O'Neill and Teal'c pursue the craft in a death glider, but are shot down, and stranded on Vorash. In an ambush, Teal'c is wounded, perhaps fatally, and captured by Tanith.
Carter, Jacob, and Daniel race to complete their repairs, and succeed in restoring power to their ship and rescuing O'Neill from the planet's surface, just as the sun explodes. However, as SG-1 enters hyperdrive, they are caught in a shock wave that instantly sends their ship four million light years away. Even at maximum speed, it will take 125 years to return home. They are alone in an unknown region of space, until a second ship appears, also thrown far off course by the shock wave. It is Apophis