Yes. Sorry, tell me about Professor Proton.
The Big Bang Theory Season 6, Episode 22
No, Professor Proton
came to me in my dream
The Big Bang Theory Season 12, Episode 5
Yeah, and my eighth favorite
episode of Professor Proton
The Big Bang Theory Season 7, Episode 7
Nice to meet you, Professor Proton.
The Big Bang Theory Season 6, Episode 22