Sheldon Auditions To Be The Next Professor Proton On The Big Bang Theory

Bob Newhart and Wil Wheaton guest star in "The Proton Regeneration."

When Sheldon ( Jim Parsons) learns that they're rebooting Professor Proton's TV show (featuring guest star Bob Newhart), the physicist dons his best lab coat to audition for the coveted lead role on the latest episode of The Big Bang Theory.

The episode, appropriately titled "The Proton Regeneration," airs at a new regular time on Thursday, Nov. 2 at 8/7c on CBS and CBS All Access.

WATCH: Preview An All-New Episode Of The Big Bang Theory Entitled "The Proton Regeneration"



There's just one problem with Sheldon's plan: Wil Wheaton is trying out for the part, too!



Meanwhile, Penny ( Kaley Cuoco) steps up to take care of Halley when Howard ( Simon Helberg) and Bernadette ( Melissa Rauch) are on bed rest.

Will Sheldon be able to fill his late mentor's shoes? And how will Penny take to babysitting duty?

STREAM: Full Episodes Of The Big Bang Theory On CBS All Access

Watch all-new episodes of The Big Bang Theory at its new regular time on Thursdays at 8/7c on CBS and CBS All Access.