Back in 2001, Mike and Sulley were a Monsters, Inc. factory dream team. Sulley racked up enough scares to get himself to the top of the scare charts and Mike functioned as the ultimate wingman, keeping his big best furry friend on top of his game. But no one just starts at the top. They had to work their way up and, it turns out, watching Mike and Sulley find their groove at college makes for a worthy Monsters, Inc. prequel. In honor of Monsters University’s June 21 release, we take a look at 10 other big-screen aliens, dinosaurs and obscure creatures deserving of a prequel of their own.