Atom's introduction in this episode is very similar to his introduction in the graphic novel, The Dark Knight Strikes Again. In that comic, a captive Ray Palmer is in what appears to be the middle of the ocean. He is attacked by a serpent, but is rescued by Batman's new sidekick, Catgirl. It is then that you find out he was shrunken down and kept in a petri dish. Similarities? Both appear in a vast expanse of water, battle a microscopic serpent, and turn out to be in petri dishes.