30 Day X-Files Challenge Day 22: Crossover Wishlist

This challenge was produced with the help of Sir Simon Milligan for the prompts!

The X-Files crossed over with several other shows over its run, creating some interesting stories with The Simpsons, Millennium, The Brady Bunch, Law & Order: SVU/Homicide: Life on the Street, and my personal favorite example, Cops. But that still leaves only about a million other properties that Mulder, Scully, and co. could have branched out into…

Prompt: What show or property would you have liked to have seen The X-Files crossover into? What kind of story would it have been?