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

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

but Professor Proton
came to me in a dream,
The Big Bang Theory Season 9, Episode 11

Nice to meet you, Professor Proton.
The Big Bang Theory Season 6, Episode 22

Here he comes, Professor Proton
The Big Bang Theory Season 6, Episode 22