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

It's in a GALAXY far, far away.
The Big Bang Theory Season 2, Episode 21

Wait. In The Hitchhikers Guide
to the Galaxy...
The Big Bang Theory Season 6, 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