A bolt of lightning on the ocean floor releases the tyrannical Nepto and his "spooky" Viking Raiders after centuries in suspended animation. Rejecting Aquaman's gesture of friendship, Nepto picks up where he left off and sets about to conquer Atlantis. At first it seems that Aquaman and Aqualad are no match for Nepto's magic, electrically-charged trident--but faithful walrus Tusky and a surprisingly dexterous octopus join forces to rescue the Aqua-duo in the nick of time. Suffering sawfish!