
living on a PLANET populated
with nothing but dogs.
The Big Bang Theory Season 5, Episode 21

Daddy needs a livable PLANET
he can rule with an iron fist.
The Big Bang Theory Season 9, Episode 12

living on a PLANET populated
with nothing but chimps.
The Big Bang Theory Season 5, Episode 21

...in which case you're with
the hottest man on the PLANET. Heh.
The Big Bang Theory Season 6, Episode 23

may have discovered
a new PLANET in our solar system?
The Big Bang Theory Season 9, Episode 16