18. Arnold Schwarzenegger (Batman & Robin)
By the time of 1997’s Batman & Robin, a template was established that required huge stars to be cast as the Dark Knight’s famous foes. No star was bigger at that time than Arnold Schwarzenegger. No one doubts Schwarzenegger is a smart guy, but he’s really not credible as the brilliant scientist Victor Fries. His specialty is action, not emotion, so the scenes where he’s required to tear up at the thought of his terminally ill wife are rather dull and unconvincing.
Image Source: IMDb