In the 1994 film, Dr. Jackson is an archaeologist who is a part of the first team to go through the Stargate on a reconnaissance mission, led by Colonel Jack O'Neil. He then becomes one of the main characters of the subsequent television series "Stargate SG-1", where he, Jack O'Neill, Samantha Carter and Teal'c make up SG-1, a part of the Stargate Program whose goal is to explore the galaxy and defend against alien threats. Jackson is part of SG-1 until his death at the end of the season 5, when he is replaced by Jonas Quinn.