Hulk [Bruce Banner]; Thunderbolt Ross; Betty Ross Talbot; Glenn Talbot; Colonel John Armbruster; Nick Fury; Aquon (first appearance; villain); Captain Omen (villain); Filius (villain; death); Infra-Worlders (villain)
Hulk has been trapped on the ocean floor by Omen but is helped by Omen's traitorous son who wants the Hulk to lead his people back to the surface world. When Omen catches wind of the betrayal, he unleashes Aquon to battle the Hulk and quell the rebellion. The fight damages Omen's submarine badly enough that he has no choice but to rise to the surface and capitulate to Filius' demands. As the Infra-Worlders joyously experience the surface for the first time, they begin to explode in the new lighter pressure. Talbot and company finish their training and head off to rescue Ross from the Russians.