A hobbit is a MORTAL, halfling inhabitant
of Middle-earth...
The Big Bang Theory Season 1, Episode 6
Mortal enemy?
The Big Bang Theory Season 5, Episode 5
Wil Wheaton is
Sheldon's MORTAL enemy.
The Big Bang Theory Season 5, Episode 5
you really have a MORTAL enemy?
The Big Bang Theory Season 5, Episode 5
From this moment on,
you are my MORTAL enemy.
The Big Bang Theory Season 5, Episode 5