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

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

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

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

Professor Proton is coming to our house.
The Big Bang Theory Season 6, Episode 22