Watch 'Big Bang Theory's' Nerdiest (and Most Amazing) Surprise

Big Bang Theory 1 Million an Episode - H 2014
Michael Yarish/Warner Bros. Entertainment Inc.

Big Bang Theory 1 Million an Episode - H 2014

CBS' The Big Bang Theory returned to its Thursday time slot with a massive bang in the form of an Oscar winner and Emmy nominee.

After revealing that he was a fan of the comedy from exec producers Chuck LorreBill Prady and Steve MolaroBilly Bob Thornton guest starred during Thursday's "The Misinterpretation Agitation" episode. And while Thornton's performance as a sad urologist to the stars will likely earn the Fargo alum a guest actor in a comedy Emmy nomination, the best part of Thursday's episode was the fact that it was largely kept under wraps.

See more'The Big Bang Theory's' Nerdiest Guest Stars

During the episode, Thornton's Dr. Oliver Lorvis came calling to his favorite pharmaceutical rep: Penny. While Leonard took issue with the fact that his bride-to-be hides her engagement ring in a bid to boost sales, Lorvis winds up having more in common with all the guys than anyone could have imagined. (As in he lives with his mother and has a collection of sci-fi memorabilia that makes everyone's head spin.)

Check out some of the highlights from the episode, below, and check out our gallery of Big Bang Theory's other nerdy guest stars here.