First Appearance: Marvel Preview #7 (1976)
Abilities: The strength, agility and sense of smell of an everyday Earth raccoon.  Oh, and he's an expert marksman, starship pilot and hand to hand combatant (for a raccoon).
Chances he's in the movie: 99%.
Lowdown: A lock to be in the movie, Rocket Raccoon is a tough talker from the planet Halfworld.  He's loyal to his friends to the end and may a few intense psychological issues. His banter with buddy Groot make him pretty much a lock for the movie.