“THE Big Bang Theory” is going back to the future. The nerdy comedy has enlisted comedic legend Christopher Lloyd.

    The “Back to the Future” grad, who also won three Emmys for his role on “Taxi,” will guest-star on the Dec. 1 episode of the comedy from Chuck Lorre, Bill Prady and showrunner Steve Molaro. Additional details about Lloyd’s role and the storyline are being kept under wraps.

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

    Lloyd’s “Big Bang Theory” pit stop comes less than a month after he was tapped to guest-star on Syfy’s time-travel drama “12 Monkeys.”

    The casting comes as “Big Bang Theory” still has some key family roles to fill for its ensemble, chief among them Howard’s father’s. Molaro said, “Howard’s father is something that’s always floating around the ether, but there are no plans at the moment.”

    (SD-Agencies)