Landing a role in a big superhero film can set up an actor for a lifetime of Comic-Con appearances.  Here are 15 performers who will never know just how sweet it could have been.

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COLIN FERRELL CONSTANTINE Justice League Dark has long been in Development Hell, with colin Farrell's Constantine one of the unfortunate casualties.

ALEC BALDWIN THOMAS WAYNE GRAGKED.COM Baldwin was cast as Batman's daddy in Joker but pulled out due to scheduling issues. It's not easy being host of

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