I may be an ALIEN, but I have urges.
The Big Bang Theory Season 8, Episode 8
[IN ALIEN LANGUAGE]
The Big Bang Theory Season 8, Episode 21
Last night, Raj accidentally made
contact with an ALIEN civilization...
The Big Bang Theory Season 4, Episode 9
...an ALIEN named Ford Prefect
pretended to be human in order to blend in...
The Big Bang Theory Season 8, Episode 8
...who's been replaced with an ALIEN pod.
The Big Bang Theory Season 2, Episode 6