It's underwater mayhew as Spider-Man and Namor must stop the evil plans of Tiger Shark and Dr. Dorcas!

The web-slinger bumps into the Prince of Atlantis in a Manhattan back alley. Why has the Sub-Mariner come to New York City? Because Tiger Shark is on the loose! However, unbeknownst to Spider-Man and the Avenging Son, Tiger Shark is not alone! Doctor Dorcas and his mutated aquanoids are lying in wait to ambush the heroes! Flashback cameos by Llyra and the Hulk.