Stargate SG-1: Season 3, Episode 22

3 - 22: Nemesis

The episode opens with Daniel Jackson confined to the infirmary recovering from an appendectomy. The rest of team is told to take a vacation, but before they can go, O'Neill is suddenly transported to Thor's ship where he is informed that the enemy the Asgard deemed greater than the Goa'uld is onboard, and Thor needs Jack's help to defeat them.