Doctor Who / Calvin & Hobbes. Calvin and Hobbes is so adorable and cute, it's my soft spot, but Dr. Who is so funny and scientific, but I'd never think of combining the two, which are complete opposites.
How Marvel smuggled Doctor Who into the Avengers. Not sure if it's real as I don't read the comic books. But still fun to think about it! <----- if I worked at Marvel that would be me: sneaking characters from other fandoms into the background