Oooh, great topic! I'd love to see the Fourth Doctor battling the Black Guardian after the Key to Time adventure. I'd also like, um, let's see . . . more fic with Four and Leela, more fic with Four and Romana, more fic with Four and Adric (Adric is almost exclusively written with Five; fandom seems to forget he started with Four), and oh, okay, if you must, more fic with Four and Sarah.

(LOTS more . . . *g*)