
and gamma becomes ALPHA...
The Big Bang Theory Season 5, Episode 7

Just turn left at Alpha Centauri,
you can't miss it.
The Big Bang Theory Season 8, Episode 21

When I fail to open this and you succeed,
it will establish you as the ALPHA male.
The Big Bang Theory Season 2, Episode 9

...known as Sheldon Alpha Five.
The Big Bang Theory Season 3, Episode 11

Alpha?
Westworld Season 2, Episode 8