King Kong

King Kong was a film from the planet Earth. It was the subject of a question at the Black Swan pub quiz in Cheldon Bonniface in April 2010. Punters were asked what the sequel was to the film, which puzzled most of those present: neither the Isley Brothers nor the Seventh Doctor were aware of a sequel, and Jason Kane could only guess Mighty Joe Young. (PROSE: Happy Endings)

The Tenth Doctor liked the film and claimed he was present at the real-life events that inspired the film, saying the film was closer to fact than is assumed. (COMIC: Echo)

King Kong Escapes was a 1967 film. (PROSE: The Adventuress of Henrietta Street)

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 — or  at a stretch.