In his very first appearance in the 1994 film as Colonel Jack O'Neil, the character leads the first team to go through the Stargate on a reconnaissance mission. He subsequently becomes the main character of the television series Stargate SG-1 created in 1997 as a sequel to the movie. In the first seven seasons of the show, Colonel Jack O'Neill, recalled from retirement after the first film, is the leader of the team SG-1, a part of the Stargate Program, whose goal is to explore the galaxy and defend against alien threats.
