Stargate SG-1 is a science fiction television program. It takes place after the movie "Stargate". The show started on July 27, 1997 on the TV channel "Showtime", from 1997-2002, and then on the TV channel "Sci Fi", from 2002-2007. The first episode, "Children of the Gods" was two hours long and was rated R because of a scene of nudity. It is the only episode in the series that was rated. The show ended with the episode, "Unending" on March 13, 2007.