[Duke]

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Sequel idea:

1) Re-activate Megatron.


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They set up the deep sea base by dumping the body there, so of course they'll do that.
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2) Have Starscream return from space with more Decepticons, like Soundwave and the Insecticons. Starscream rebels against Megatron, Megatron beats down Starscream.


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This would be sweet, but it seems like they all have the powers that soundwave has now. It would be sad to not have the coolest character in any of the new movies, but I don't really see a place for him anymore.
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3) Dinobots!


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Definitely. Also Devastator and the Constructicons.
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4) End on down note (Optimus Prime captured or something), setting up for big finish in part 3.

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Like Empire Strikes Back. Good call.