
...he's allergic to Earth nuts,
but I'm the ALIEN.
The Big Bang Theory Season 8, Episode 21

Okay, here's a question.
As an ALIEN pretending to be human...
The Big Bang Theory Season 8, Episode 8

...who's been replaced with an ALIEN pod.
The Big Bang Theory Season 2, Episode 6

...discover our weaknesses,
and report back to your ALIEN overlords.
The Big Bang Theory Season 3, Episode 15
![There was no alien.
[chuckles]
There was no alien.
[chuckles]](data:image/png;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=)
There was no ALIEN.
[chuckles]
The Big Bang Theory Season 12, Episode 18