Marvel has released the animated origin short films for their Guardians of the Galaxy animated series. The first short focuses on Star-Lord and the second centers on Groot and the third on Rocket Raccoon. They are all two-part shorts, and they offer up some interesting background information on the characters as it pertains to the animated series. They aren’t necessarily going with the origins of the comic books, but they are heavily inspired by the movie.
At 2 minutes at a time, it won’t take you too long to get trough them. If you liked the movie, I’ll guarantee you’ll like these.