
George Costanza to Jerry Seinfeld – “Everybody’s doing something. We’ll do nothing.”
JERRY: What do we got?
GEORGE: An idea.
JERRY: What idea?
GEORGE: An idea for the show.
JERRY: I still don’t know what the idea is.
GEORGE: It’s about nothing.
JERRY: Right.
GEORGE: Everybody’s doing something, we’ll do nothing.
JERRY: So, we go into NBC, we tell them we’ve got an idea for a show about nothing.
GEORGE: Exactly.
JERRY: They say, “What’s your show about?” I say, “Nothing.”
GEORGE: There you go.
(A moment passes)
JERRY: (Nodding) I think you may have something there.
[Jerry’s apartment]
(Jerry’s explaining George’s idea to Kramer)
JERRY: So, the show would be about my real life. And one of the characters would be based on you.
KRAMER: (Thinks) No, I don’t think so.
JERRY: What do you mean you don’t think so?
KRAMER: I don’t like it.

Who is George Costanza?
George Costanza (Jason Alexander) is Jerry’s oldest friend and the show’s patron saint of bad decisions — “Lord of the Idiots,” serial job-loser, occasional architect named Art Vandelay, and, when the moment demands it, a marine biologist. Based loosely on co-creator Larry David, which explains a lot. Appears in every episode but one, presumably because he had nowhere else to be.

