Stargate SG-1

When powerful aliens come through Earth's Stargate, Colonel Jack O'Neill returns to Abydos to retrieve Daniel Jackson, who has discovered that the alien transit system includes much more than the two planets.

Major Kawalsky is possessed by a Goa'uld, and the SGC must find a way to remove it without killing him.

An alien civilization is forced to reconsider their views on women when Carter rebels against their social customs.

Members of SG-1 become infected with an alien virus that turns them into primitive beings. Dr. Fraiser must find a cure to save the team and the alien population from whom it was contracted.

SG-1 must stop a renegade Stargate commander, who has gone mad and set himself up as a god on an alien planet.

During an off-world assignment, Jack is struck down by energy from a blue crystal... which creates a duplicate of him that returns to Earth in Jack's place.