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Once he ruled CYBERTRON with a brutal (and literal) iron fist... left for dead four million years ago, SENTINEL PRIME is back. But in a world where STARSCREAM rules CYBERTRON, OPTIMUS PRIME has invaded Earth, and MEGATRON is an AUTOBOT - SENTINEL doesn't like what he sees! Collects the Titans Return one-shot, Transformers #56 - 57, and Transformers: More Than Meets The Eye #56 - 57.