Stargate SG-1: Season 5

After Apophis has brainwashed Teal'c, SG-1 and Jacob prepare to fight against their foe on board Cronus's ship. A mysterious ship then appears and attacks Apophis' ship, disabling it, and causing them to flee, giving SG-1 the chance to get on board. But danger lurks in the form of an army of Replicator bugs and an auto-destruct program.

Teal'c has been saved from dying on Apophis' ship but remains loyal to his old master. Bra'tac uses an old Jaffa ritual that will either bring Teal'c back or kill him.

After falling unconscious, Carter returns from Velona (P3X-636), a planet full of ruins, suffering from suspected exhaustion. But she begins seeing a mysterious young man named Orlin who can walk through solid objects. But everyone believes that she's seeing things.

O'Neill remains on a planet designated P7S-441 to protect Lieutenant Tyler, a fifth member of SG-1 whom only the other members of SG-1 can recall. Back on Earth, Hammond informs the team that Tyler doesn't even exist while Col. Simmons returns, seeking to shut the SGC down, citing the latest alien mind games as a possible safety risk.

SG-1 travel to K'Tau (P39-865) and discovers that the sun has been shifted to the infrared end of the spectrum. All life on the planet is doomed, and SG-1 are responsible. The planet's inhabitants are Norse people and worship the Asgard, and believe that the reddening sky is a sign from their Gods. In reality, the event is a solar reaction caused by SG-1's wormhole that spells death for the planet and its people.

Dr. Fraiser's adopted daughter, Cassandra, enters puberty and begins developing telekinetic abilities, but the strain of producing so much energy is causing multiple organ failure. Fraiser and SG-1 fear that they might not be able to stop the life-threatening changes caused by Goa'uld Nirrti's genetic experiments.

Chaka, the Unas whom Dr. Jackson befriended, has been kidnapped and taken to a planet where humans use Unases as slaves. On a rescue mission, Jackson is risking not only SG-1's safety but also an age-old system.

SG-1 gets trapped in an ancient ziggurat on P2X-338 along with a Russian team. Here they discover the remains of the original Russian team who had gone missing and there's also a Goa'uld on the loose, one who's willing to kill and inhabit anyone it wants with the sole intention of escaping.

The Tollan, in a highly unusual change of policy, agree to share advanced technology with Earth but Carter's friend, Narim, warns that this might spell great danger for Earth.

SG-1 visits an agricultural planet (P3A-194) inhabited by the Volians, who introduce them to their more technologically advanced allies, the Aschen, who propose an alliance with Earth. After Daniel Jackson and Teal'c discover the Aschen's world to be the gate address they forbade themselves from dialing ("2010"), Earth severs all contact with the Aschen.

Carter is kidnapped by a dying millionaire, forcing O'Neill to team up with Harry Maybourne in order to find her.

When Stargate Command learns of a television show whose premise closely resembles its operations, SG-1 investigates. They find that an alien named Martin Lloyd ("Point of No Return") is giving the producers their ideas.

SG-1 trains a team of raw cadets, and Colonel O'Neill is forced to take them into a real-life battle situation when he learns of a possible alien incursion at the SGC.

On P3X-116, SG-1 comes under fire from Tanith. Teal'c shoots down Tanith's Al'kesh, and the ship crashes into the Stargate as Teal'c is in transit to Earth. Teal'c does not rematerialize but his pattern is stuck in the Earth-side gate. With a deadline of 48 hours, SG-1 must find a way to save Teal'c before he is lost forever. As Daniel and Major Paul Davis attempt to make a deal with the Russians, O'Neill finds himself forming an unlikely partnership with rogue agent Harry Maybourne as General H

There is a truce among the Goa'uld and the System Lords meet on a heavily guarded space station. The Tok'ra plan to kill them all, but require a human who can speak fluent Goa'uld and Daniel is the only qualified candidate. The Tok'ra create a version of the Reol chemical ("The Fifth Man") for the undercover mission. Meanwhile, Anubis attacks an outpost of Kali on the planet Cerador, destroying two motherships. Lord Zipacna, under orders from Anubis, attacks Revanna, the site of the main Tok'ra

A powerful System Lord shows himself for the first time in a thousand years and offers to destroy the Tau'ri and Tok'ra. Meanwhile, SG-1 and Lt. Elliot/Lantash are trying to escape the Tok'ra base.

An amateur astronomer discovers a rogue asteroid on a collision course with Earth. SG-1 and a couple of engineers repair the cargoship that crashed on Revanna and head for earth. Just before they reach the asteroid, there is a problem with one of the engines. They start heading for the asteroid, but manage to stop at the last moment. Teal'c and O'Neill place a naquadah enhanced nuclear weapon. Carter discovers that the core of the asteroid is composed of naquadah, so exploding the nuke would des

The Jaffa rebellion has a new leader named K'tano, who seems almost too good to be true. SG-1 visits K'tano's Jaffa camp on the planet Cal Mah (meaning "sanctuary") to negotiate an alliance. However, K'tano sends rebel Jaffa on a suicide mission to a stronghold under the control of Nirrti, and when K'tano sends Teal'c on a suicide mission against the Goa'uld system lord Yu, he finds that the new leader isn't what he seems.

The team finds an android that somehow managed to survive a Replicator attack. They learn she is the mother of all Replicators, but has the mentality of a young child. Danielle Nicolet guest stars as Reese.

The Latonans are a once-advanced race that abandoned technology to focus on mental development. Their homeworld Latona (P2A-018) is defended by a 500-year-old device called the Sentinel, which was inadvertently deactivated by rogue NID operatives seeking to reverse-engineer it. With Latona being invaded by the Goa'uld Svarog, SG-1 brings the NID agents with them to repair the Sentinel and save the Latonans from the Goa'uld.

Daniel incurs lethal radiation exposure when he prevents a potentially cataclysmic accident in a weapons laboratory on the planet Langara (P9Y-4C3), but the mysterious Oma Desala shows him that death can simply be another beginning. While the alien government responsible for the lab accuses him of attempting to sabotage their research, the Kelownan Jonas Quinn tries to negotiate with SG-1.

As Jack, Sam and Teal'c struggle to come to terms with losing Daniel, an Asgard scientist Heimdall is stranded on Adara II, a planet under attack by the Goa'uld. As the Asgard have no spare ships, they ask Stargate Command, particularly SG-1 to help, using their salvaged Goa'uld cargo ship. Anubis is finally revealed.