King Kong

King Kong was a film from the planet Earth. It was the subject of a question at the Black Swan pub quiz. Punters were asked what the sequel was to the film, which puzzled most of those there present - neither The Isley Brothers nor the Seventh Doctor were aware of a sequel, and Jason Kane could only guess Mighty Joe Young. (NA: Happy Endings)

Behind the scenes
In fact, Mighty Joe Young was a semi-remake of King Kong, and the correct real world answer, not mentioned in Happy Endings at all, is Son of Kong — or King Kong Lives at a pinch.