This exciting release from the Transformers spin-off Transformers Prime offers all 21 episodes of the show's first season, which goes deeper into the history of the Autobots and Decepticons than ever before, following familiar heroes like Optimus Prime, Bumblebee, Arcee, Ratchet, and Bulkhead as they wage an epic defense against Megatron, and the rest of the Decepticons, who remain bent on the domination of Earth, and the complete destruction of human kind.