People piled on Dean Cain for mocking an actor almost half his age. It seems former Superman Dean Cain doesn’t appreciate the actor starring in the latest entry in the DC Universe film franchise. Cain, who played the last son of Krypton on TV in the 90s but whose most recent role was cosplaying as an ICE agent, joined a gang of internet trolls on Sunday to gripe about a newly released poster for the upcoming “Supergirl” movie. After boosting a question about how the character could have pierced