First question: "Brainiac vs. {Autobots+Decepticons}" or "Brainiac vs. {Autobots vs. Decepticons}" ? I'm not clear on what you're specifying.
Second question: Just Brainiac, not Lex Luthor, nor anyone else? (Krypton = Energon? :blink: )
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I'd imagine that, since the Transformers are a homeless race, that Brainiac would view them as a sort of competition and try to wipe them out. But that's just me. :huh.: