...that could serve as a portal
to a PARALLEL universe.
The Big Bang Theory Season 6, Episode 8
That's an inexact PARALLEL.
The Big Bang Theory Season 3, Episode 2
The first 43 PARALLEL universes I've checked
proved to be empty.
The Big Bang Theory Season 6, Episode 8
May I point out in a PARALLEL universe
your friends are saying:
The Big Bang Theory Season 4, Episode 6
If there are an infinite number
of PARALLEL universes...
The Big Bang Theory Season 4, Episode 5