Jim Parsons really, truly doesn't know if he's returning to 'Big Bang Theory'

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On the season 7 finale of Big Bang Theory, Sheldon (Jim Parsons) leaves on a train. That made Parsons wonder,

? We caught up with the Emmy winner at Comic-Con to talk about that possibility (he and his Big Bang co-stars still don't have contracts for season 8), and about his upcoming animated movie, Home, with Rihanna.