
I am Sheldon's 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

There's no Leo. How can you say that?
The Big Bang Theory Season 1, Episode 10

Whom most people call Leo,
but he also answers to Lee.
The Big Bang Theory Season 1, Episode 10

Now, look, Sheldon's cousin Leo escaped
rehab and he's in a Motel 8 in Long Beach.
The Big Bang Theory Season 1, Episode 10