Wedding Plans, Professor Proton, and More! 'Extra' Visits 'The Big Bang Theory'

“Extra’s” Renee Bargh stopped by “The Big Bang Theory” to chat with Jim Parsons, Mayim Bialik and guest star Bob Newhart.

Renee gets the scoop on Sheldon and Amy’s wedding plans and the return of Professor Proton!

Watch “The Big Bang Theory” Thursdays at 8 p.m. on CBS.