
Professor Proton said
I should call him Arthur.
The Big Bang Theory Season 6, Episode 22

that people would still
call me Professor Proton
The Big Bang Theory Season 7, Episode 7

# Here he comes,
Professor Proton. #
The Big Bang Theory Season 11, Episode 15

Yes. Sorry, tell me about Professor Proton.
The Big Bang Theory Season 6, Episode 22

Hey, everybody.
I'm Professor Proton.
The Big Bang Theory Season 11, Episode 15