Professor Proton (Bob Newhart) helps Sheldon deal with grief; Leonard gets into a competition with Penny; Bernadette and Amy prepare a "Star Wars Day" gift for the guys.
Director:
Mark Cendrowski
Cast:
Johnny Galecki
Jim Parsons
Kaley Cuoco-Sweeting
Simon Helberg
Kunal Nayyar
Mayim Bialik
Melissa Rauch
Bob Newhart