Ripple Effect

Multiple SG-1s show up at Stargate Command, leading the "real" team to conclude that they have each been inadvertently displaced from different parallel realities, one team of which has Janet Frasier and Martouf, two old SG-1 friends who are dead in the current reality. The events are ultimately revealed to be a plan by one of the teams to steal Atlantis' ZPM, but SG-1 foils them and sends everyone home.