This sequel to the 1994 movie Stargate chronicles the further adventures of SGC (Stargate Command). Earth's military sends out SG teams to explore new planets, find technology, and oppose the Goa'uld. Jack O'Neill and Daniel Jackson from the movie are part of SG-1.
SG-1 first encounter him as a Viking holographic recording on the planet Cimmeria in "Thor's Hammer". They meet the real Thor one season later when he saves Cimmeria from Heru-ur's invasion.
After O'Neill manages to make friendly contact with the Asgard in their galaxy, Thor includes Earth in the Protected Planets Treaty to safeguard it from a direct Goa'uld attack.
Late in season 3, SG-1 helps to destroy Thor's ship, the Beliskner, which has been overtaken by the Replicators, in Nemesis. Impressed by SG-1's primitive but effective tactics, Thor requests SG-1 to help fight the Replicators in his Asgard homeworld soon after, in Small Victories.
Anubis captures Thor and probes his mind for Asgard technology, and Thor's body lapses into a coma. SG-1 retrieve Thor's consciousness from the ship's database a while later, and transfer it into a new body.
Thor asks for SG-1's assistance after his people's plan to trap the Replicators inside a time-dilation field on the planet Hala backfired.
Thor personally makes an appearance at a secret meeting between the permanent members of Earth's UN Security Council taking place in the Pentagon, to ensure the SGC retains control over the Earth Stargate.
As the time-dilation device on Hala cannot keep the Replicators bottled up forever, Thor collapses Hala's sun into a black hole, but some Replicators escape. Some weeks later, Thor and Carter modify their Replicator Disruptor, but as the Replicators quickly adapt, they use the Dakara Superweapon to destroy all Replicators in one strike. Thor gets a new clone body soon after.
Thor summons the Odyssey to the Asgard homeworld Orilla and installs the entire knowledge base of the Asgard race on the ship. As attempts to save the Asgard civilization from their genetic difficulties have failed, he once again calls humans from Earth "The Fifth Race" and makes it their turn to preserve the future. Thor perishes along with the rest of the Asgard race when their planet self-destructs under Ori attack.
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