Transformers: Prime - Season 1

The Autobots live secretly on Earth, protecting their identities while continuing their fight against the Decepticons. Optimus Prime, Bumblebee, Arcee, Ratchet, Bulkhead, and the rest of Team Prime are joined by three human teens who become part of their hidden world. When Megatron returns with a mysterious and dangerous element, the Autobots must prepare for a new and escalating battle.