Based on the 2007 film, Transformers invites gamers into a world of mechanized shape-shifters called the Autobots and the Decepticons. By selecting an alliance, gamers will work their way through one of two campaigns and ultimately decide to defend Earth or watch it burn. As a robot, players experience combat in seven fully destructible environments as they attempt to complete objectives and missions including destroying drones. When gamers are in car form, they can compete in a variety of point-to-point races. Optimus Prime, Megatron, Starscream, and Ironhide make a return in the game, and players can shift from vehicle to robot on the fly. Content exclusive to the PSP includes 20 playable characters, an expanded storyline, Ad-hoc multiplayer action, and robot customization features. ~ Gracie Leach, All Game Guide