Crichton is reunited with the Ancients when an old acquaintance unlocks the secret of wormhole technology - threatening the entire galaxy should the Scarrans acquire it. Talyn and Crais are blinded by a solar flare, while John attempts to force Scorpius' neural clone from his mind.

SG-1 gates to a world which they find worships the Norse god, Freyr. The people believe the team are Elves, as disciples of Freyr are known as. All seems to go well until the planet's sky turns red. The local religious interpreter decries that the SG-1 team is the cause of this strange occurrence, suggesting that SG-1 has brought on Rag'norok on the people ? meaning the end of time. The events of SG-1's arrival lead to the possible demise of all of the planet's inhabitants, and the team's own peril. O'Neill is able to request help from the Asgard high counsel via their beaming viewing system in the villages temple, but the Asgard counsel tells him they are prevented from helping, due to provisions in the 'protected planets' treaty with the Goa'uld. SG-1 must find their own way to save the planet, and its people on their own.