While on patrol in the Atlantic, the entire crew of the nuclear submarine USS California is killed by an unknown attacker. At S.T.A.R. Labs, the Justice League's headquarters, Cyborg is given the news by Colonel Steve Trevor. He teleports to the sub via a Boom tube, finds hand prints on the hull and discovers that nuclear missiles are missing. Cyborg, Flash, Shazam, Superman, Wonder Woman, Green Lantern, and Batman inspect the recovered California. Diana identifies the enemy as warriors from Atlantis, beings turned into underwater creatures by their king's mystical trident. Batman and Superman decide to meet Atlantis-expert Stephen Shin.
