At the risk of mixing nerd metaphors, "The Justice League Recombination" — a DC Comics-themed episode of The Big Bang Theory — promises to cause many disturbances in the force. Penny is back with Zack (Brian Thomas Smith), that Tall Drink of Manbot from last season who makes Leonard feel positively pubescent.
"The writers and I were thinking, 'Is there any reason Sheldon would want Zack for anything?'" explains executive producer Bill Prady. (Zack will likely reappear this season, but Prady isn't sure if he'll be a bona fide romantic threat.) "We started with, 'He's big and strong — maybe Sheldon needs something lifted? And that led to, 'What if Sheldon needed a Superman?'" As it happened, he did.
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