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.