Brilliant Idea #901231: A Doctor Who episode.
The Doctor and his/her companion find themselves in New York circa early 1920s and meet a young, tough scrapper by the name of Jacob Kurtzburg ("Jack" to his friends). He tags along on an adventure where they meet cosmic beings.
The episode becomes a huge tribute to Jack Kirby, including special effects for the energy used by the beings that strongly resemble his signature "Kirby Dots."
Ideally, I'd end it similar to the Van Gogh episode, where they show how Kirby influenced artists in the future and inspired generations. But that'd be a massive rights issue to show characters from DC or Marvel.