Book: Harry Potter 7 (or textbooks for animation class, but that's boring).
Movie: Mystery Science Theater 3000 'Devil Fish'
Game: Half Life 2 episode 2.
Put all of that in a blender and you get Voldemort trying to take over the world while riding a magical sharktopus, and the only people that can defeat him is Gordon Freeman and Harry Potter, while Mike, Crow and Tom just sit in the background cracking jokes....
I want to see this movie NOW!