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The Big Bang Theory casts Christopher Lloyd

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Mike Marsland/WireImage; Michael Yarish/Warner Bros.

The Big Bang Theory is going Back to the Future.

EW has learned that BTTF alum Christopher Lloyd will guest star in the Dec. 1 episode of the CBS comedy.

Details on his role are scarce, but the casting comes on the heels of the news that the former Doc Brown will also appear on the upcoming third season of Syfy’s 12 Monkeys.

“We’re so excited to be working with Christopher Lloyd, and think we’ve created a fun part that fans will really enjoy,” Big Bang producers said in a statement.

The Big Bang Theory airs Thursdays at 8 p.m. ET on CBS.