Star Trek 5: The restaurant in space - Saturday Night Live, 1986


If you haven't seen this, it's very much worth watching. I love how "the wrath of Khan" is done by bringing in a food inspector. "Full revolve, Mr Sulu!"
William Shatner was the guest host in this episode, and was in multiple skits, including one where he was himself answering questions from fans at a Star Trek convention, and another where he played Oliver North in Senate hearings.