"Nemesis" is the last episode from season 3 of the science fiction television series Stargate SG-1. Written by Robert C. Cooper and directed by Martin Wood, the episode first aired in the United Kingdom on Sky One on February 11, 2000, and had its American premiere on Showtime on March 8, 2000. The episode sets up the Replicators as a new major enemy, ending in a cliffhanger that is resumed in the season 4 premiere "Small Victories". "Nemesis" was the first SG-1 episode to be filmed entirely on 35 mm film before the series switched from 16 mm film to 35 mm film for all purposes in season 4. A visual effects milestone for the series, the episode was nominated for an Emmy Award in the "Outstanding Special Visual Effects for a Series" category, and won a Leo Award for "Best Overall Sound in a Dramatic Series". Plot The SG-1 team gets leave time as Daniel Jackson (Michael Shanks) had his appendix removed. Just after Major Carter (Amanda Tapping) declines Colonel O'Neill's (Richard Dean Anderson) invitation to go fishing, O'Neill is beamed aboard the cloaked Asgard ship Beliskner orbiting Earth. Encountering bug-like robots, O'Neill learns from the dying Asgard, Thor, that the creatures are called Replicators. They ingest the ship's alloys in order to self-replicate and will eventually land on Earth in the search of more raw material. O'Neill contacts Stargate Command with a request to beam up explosives, however, General Hammond (Don S. Davis) also sends along Carter and Teal'c (Christopher Judge) against O'Neill's wishes. An Earth shuttle may be sent to pick them up later. SG-1 plan to steer the vessel towards Earth to vaporize it during atmospheric reentry. Because the Replicators prevent SG-1 from retaking the bridge, Carter and Thor suggest placing an elementary naqahdah-enhanced bomb on the deceleration drive. When Teal'c leaves the spaceship to place the bomb on the outside of the hull, his airtank blows, however, Carter manages to beam him back on board. Thor, whose vitals crash at this moment, is put into a stasis pod to preserve his life. While SG-1 waits for the right time to detonate the bomb, they must devise a plan to get off the ship. They eventually beam Stargate Command's Stargate on-board and intend to travel to the planet P3X-234 before returning home using Earth's secondary gate ("Touchstone"). After Teal'c has dialed the gate manually, O'Neill detonates