Here he comes, Professor Proton
The Big Bang Theory Season 6, Episode 22
# Here he comes,
Professor Proton. #
The Big Bang Theory Season 11, Episode 15
I just don't want to be
Professor Proton anymore.
The Big Bang Theory Season 6, Episode 22
"The Effect of High Energy Muons
on Proton Pion Scattering
The Big Bang Theory Season 12, Episode 9