PENNY: Previously on
The Big Bang Theory...
The Big Bang Theory Season 10, Episode 1
confirmed your THEORY.
The Big Bang Theory Season 12, Episode 13
BERNADETTE: Previously on
The Big Bang Theory...
The Big Bang Theory Season 10, Episode 24
At least they're talking about the THEORY.
I mean, that's what's important.
The Big Bang Theory Season 8, Episode 18
Okay, but that's just a THEORY.
The Big Bang Theory Season 10, Episode 15