in Hitchhiker's Guide
to the Galaxy,
The Big Bang Theory Season 7, Episode 16
...so that he could write an entry about Earth
for The Hitchhiker's Guide to the Galaxy.
The Big Bang Theory Season 8, Episode 8
The Milky Way is a GALAXY in space.
The Big Bang Theory Season 6, Episode 5
Hitchhiker's Guide
to the Galaxy.
The Big Bang Theory Season 7, Episode 6
Yeah, see, if you just change the story
to the destruction of a GALAXY,
The Big Bang Theory Season 9, Episode 14