Whiz Comics #115 (1949)

Out at sea, a freighter is carrying a fortune of gold buillion and uncut diamonds when they are stopped the sudden appearance of a sperm whale. They try to turn to avoid it, but are balked by a second sperm whale in their path, soon finding themselves surrounded by them. Emerging from a single-man submarine appears a man wearing a green toga, carrying a trident and wearing a tiny crown, who says that he is Neptune, King of the Seas, and that he's boarding their ship, demanding “tribute.” When one of the sailors says he's just lying about it, “Neptune” orders an octopus to grab four of them, finally prompting their radio-man to send a distress signal out that Billy picks up at a Station WHIZ listening post. Calling SHAZAM, Captain Marvel soon flies out to meet them and punches the enlarged cephalod in the face and whips it into the sea by one tentacle, worrying this “Neptune” who retreats to his submarine. Once at his craft, Captain Marvel pulls him out and says that he's not actually “King Neptune,” but Jasper Joad, a “man-without-a-country” due to his constant criminal and treasonous activities. Thus, being de facto exiled to the sea, he decided to get revenge and discovered a way to use mental waves to make ocean creatures obey him, which he then uses to make one of his sperm whales ram the ship to distract Captain Marvel and let him escape. The World's Mightiest Mortal easily shoves the whale away until he's gone and decides that he's going to track down Joad. Later, Joad appears at a beach where he starts using large green giant lobsters to invade a small island, only for Captain Marvel to arrive and trap them all in a large fishing net and delivers them all to a lobster cannery, finding Joad has escaped by tearing the net himself. Joad plans on an all-out invasion and moves to the harbor of “a big city” and unleashes his army of a very large turtle, an eel, an octopus and a walrus. Captain Marvel easily spots a large queue of sea creatures exiting the harbor, stopping the giant turtle from blocking traffic abd then saving an elderly man being bounced between two seals like a beachball by throwing them into the sewer and expecting them to get back to the ocean that way before he finally defeats the walrus by shoving a barrel over his head. Soon after, he finds Joad riding on a different giant turtle and goes to attack him, only for Joad to summon a Sea Serpent which the World's Mightiest Mortal ties in to a knot. Grabbing Joad, Captain Marvel demands he has the sea creatures leave the city and, when he feels like likely won't do it, pushes an electric eel at both sides of his head to give him a makeshift electro-shock therapy that negates his mental command of sea animals by “disrupting his mental-waves” as shown when a lobster pinches his shin. Captain Marvel sees him quickly to prison, saying he won't be King Neptune or a “man-without-a-country,” but a number!