Five-part miniseries that began the new Transformers prime series. Optimus Prime, Bumblebee, Arcee, Ratchet, Bulkhead, and many others are back to 'roll out' against Megatron's latest attempt to conquer Earth. Megatron proves to be more powerful than ever, having acquired a rare element that allows him mastery over life itself. 'Team Prime' may be few against the Decepticon hordes, but they find increased strength via bonds forged with three human teenagers.