Captain Barracuda attacks Atlantis, nearly kills Namor and steals his Horn as he summons the creatures of the deep to follow him ashore to plunder the surface world. As NYC comes under attack, Namor must convince the FF that he is not leading this attack. They combine forces to track down Barracuda and take back the Horn before he can destroy the city. While the FF fight, Sue finds Barracuda and takes back the Horn as Namor arrives and confronts his enemy. With the Horn in hand, Namor calls off the attack and he and his creatures return to the ocean deep.