The Avengers Meet the Guardians of the Galaxy

Beth has just turned 18, and life couldn't be greater. After buying a mysterious locket from a flea market with her birthday cash, some crime-fighters from across the galaxy pay her and the Avengers a visit. Beth discovers that her locket will determine the fate of the universe if it finds its way into an alien warlord's clutches. Will Beth be able to save the world as we know it?