Sheldon hires Professor Proton (guest star Bob Newhart) to come to his apartment on The Big Bang Theory. "The Proton Resurgence" is the 22nd episode of the show's sixth season.

The Big Bang Theory Season 6 Episode 22 Quotes

Howard: Why don't you put her in a kennel?
Raj: Why don't you put your mother in a home?
Howard: To be honest, she'd do better in the kennel.

Leonard: It was pretty cool.
Penny: Aw, so cute when you use the word "cool" wrong. Like when kids say "pasghetti."