
in Hitchhiker's Guide
to the Galaxy,
The Big Bang Theory Season 7, Episode 16

the guardians of peace
and justice in the GALAXY.
The Big Bang Theory Season 9, Episode 11

Now, in the beloved novel
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

Which is also called
The Hitchhiker's Guide to the Galaxy.
The Big Bang Theory Season 8, Episode 8