
Professor Proton,
it's an honor to meet you.
The Big Bang Theory Season 6, Episode 22

Hey, Professor Proton.
The Big Bang Theory Season 11, Episode 15

Yeah, and my eighth favorite
episode of Professor Proton
The Big Bang Theory Season 7, Episode 7

this Professor Proton thing
pretty hard.
The Big Bang Theory Season 7, Episode 22

I know you have strong feelings
about Professor Proton,
The Big Bang Theory Season 11, Episode 15