User blog:DeltaSquad5/What would you like to see a crossover of?

In the past, we've had sci-fi crossovers in comics, books, tv shows and movies, such as the numerous 'Alien vs. Predator' crossovers or the 'Doctor Who/Star Trek 'Assimilation' comics among others, with varying results.

My question was, if you could see a sci-fi crossover been put together (as a book, comic, tv show or movie), what would you like to see been mixed together?