Justice League Wonder Woman: [holding Atom in her palm] Ready?
Atom: Just don't squeeze.

Atom Ant Show, The Big Fats: This world isn't big enough for me and that Atom Ant, I'm gonna challenge him to a showdown!
Atom Ant: Okay Big Fats, I accept your challenge, Show me down!
Big Fats: I'm giving you two minutes to get out of town!
Atom Ant: Pardon me for being nosy. [grabs Big Fats' nose and starts stretching it out]
Big Fats: Hold it Atom Ant, that streching things a little too far... [Atom Ant releases Big Fats' Nose, which snaps onto his face.]

Justice League [Cadmus medic is about to see to Captain Atom]
Superman: Don't you touch him! He's Justice League. [Carries Captain Atom out]

Justice League [Captain Atom is trying to stop Superman and Huntress from rescuing Question]
Superman: This is ridiculous. If you're not gonna help us, get out of our way.
Captain Atom: Not an option Superman. I've got my orders, legal and proper.
Huntress: Dude, Superman just told you to step aside.
Captain Atom: I heard him, ma'am. Not gonna happen.
[Superman makes to move past Captain Atom, who punches him across the room]

Justice League Green Arrow: So what's the plan?
Captain Atom: I shove these carbon rods in the robots reactor, that should stop it.
Green Arrow: I gotta say that's not much of a plan, if you get that close the heat will fry you
Captain Atom: I know
Green Arrow: But..
Captain Atom: If this doesn't work, contact the League, they'll know what to do next.
Green Arrow: Captain.
[Green Arrow shakes hands with Captain Atom]

Justice League Green Arrow: Is that a Containment suit?
Captain Atom: Uh-huh. I'm not flesh and blood anymore, just living energy.
Green Arrow: That wouldn't be nuclear energy, would it?
Captain Atom: With a name like Captain Atom, what do you think?
Green Arrow: I think you're what I marched against back in college.

Deep Space Nine General Denning: What do you know about atom bombs?
Quark: My people have been watching your world for years. We know all about you: baseball, root beer, darts, atom bombs.

George Wald It would be a poor thing to be an atom in a universe without physicists, and physicists are made of atoms. A physicist is an atom's way of knowing about atoms.

Justice League The Atom: [confronted by a (relatively) giant nanomachine] He's bigger than my car now, Katie. Personally, I blame you.
Katie: How can it possibly be my fault?
The Atom: Because otherwise it would be my fault. That can't be right; I'm a professor.

Justice League The Atom: The android – why does he hate you so much?
Lex: I once took advantage of his naiveté. He's not naïve any more, and I've stopped taking advantage of the innocent.
The Atom: Let's hope you'll be more convincing if you have to tell him that.