Quote from Stuart in the episode Spoiler: Gary Dies
Stuart: Anyway, uh, we gotta go. Bert: Yeah, Caltech. We're on a quest. Denise: There's no more Caltech. What's left of it is a death trap. Bert: We don't have a choice. Stuart: Yeah, an alternate version of me came from another universe and explained how I can undo the apocalypse. Bert: It was really cool. Denise: An alternate version of you? Bert: Yeah, same pasty face and same whiny voice. Stuart: It was like looking in a mirror.