Stargate SG-1 season 5

After 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. 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 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 , 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 , 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 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 ") is giving the producers their ideas.

SG-1 is running training simulations for a group of new recruits. Things begin to get more serious when aliens invade.

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 Hammond deals with Colonel Frank Simmons. Carter finds herself collaborating with the obnoxious Dr. Rodney McKay (David Hewlett), the world's foremost expert on the Stargate, who has already decided that trying to save Teal'c is a waste of time.

There is a truce among the Goa'uld and the ") 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 base after Vorash.

A powerful . 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 destroy Earth. They manage to use the ship's hyperspace engines to transfer the asteroid to the other side of earth.

The Jaffa rebellion has a new leader named , he finds that the new leader isn't what he seems.

The team finds an android that somehow managed to survive a 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 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 tries to negotiate with SG-1.

As Jack, Sam and Teal'c struggle to come to terms with losing Daniel, an 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.