TV series example of the word

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

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

The Big Bang Theory Season 6, Episode 22
Professor Proton was never late when he was on TV.

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

The Big Bang Theory Season 12, Episode 9
"The Effect of High Energy Muons on Proton Pion Scattering