Lonely, overweight Billy Barton's birthday has come except he has no friends to share it with. So he wishes upon a shooting star for a friend and is almost immediately granted his wish.
His friend: a zombie named RIP.
Chaos and blood-soaked mayhem ensues as Billy, with RIP's help, seeks to level the playing field between him and the school bullies who make fun of his weight. But all is not what it seems, and when a new girl arrives at the school who piques Billy's interest, it soon becomes apparent that RIP has an agenda of his own.