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

Hey, I got an email
from Professor Proton.
The Big Bang Theory Season 7, Episode 7

I just don't want to be
Professor Proton anymore.
The Big Bang Theory Season 6, Episode 22

Professor Proton hosted my favorite
science show when I was a child.
The Big Bang Theory Season 6, Episode 22

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