
"Batman Two" has to be the second Robin,
Jason Todd.
The Big Bang Theory Season 2, Episode 20

That's a great idea. I'm gonna get him
to sign a Batman as well.
The Big Bang Theory Season 3, Episode 16

- (IN DEEP VOICE) I'm Batman.
- Damn it, Sheldon.
The Big Bang Theory Season 2, Episode 1

...I could be Batman.
The Big Bang Theory Season 2, Episode 1