Re: What villains are left for a 4th film?
I'm not that familiar with the Transformers universe but I really hope Megatron is not coming back anymore.
WOLVERINE X CYCLOPS X STORM X ROGUE X ICEMAN X PROFESSOR X
X-MEN - FANTASTIC FOUR
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MISTER FANTASTIC 4 INVISIBLE WOMAN 4 THE THING 4 HUMAN TORCH