Sheldon does not have a cousin Leo.
The Big Bang Theory Season 1, Episode 10
Leo, this is Penny,
our friend and neighbor.
The Big Bang Theory Season 1, Episode 10
Hi, Leo, how are you feeling?
The Big Bang Theory Season 1, Episode 10
Of course not, there's no cousin Leo,
there's no intervention.
The Big Bang Theory Season 1, Episode 10
But beyond that,
I have realized the Leo I described...
The Big Bang Theory Season 1, Episode 10