I am a huge fan of mashups and the latest I have heard of is The Oz/Wonderland Chronicles.
Dorothy (The Wonderful Wizard of Oz) and Alice (Peter Pan) have grown up and gone to college. They're now roommates - plus Wendy Darling (Peter Pan) and Susan Pevensie (The Chronicles of Narnia).
Apparantly none remembers her childhood adventure, but that's about to change....
Wowzer! Dorothy, Alice, Wendy, and Susan.
Talk about the Fantastic Four!