Dr. David Banner meets a former student, who has a magical hammer that summons Thor, a Norse god who is prevented from entering Valhalla. When the two superheroes stop feuding long enough to breathe, they are a team unmatched by any of their enemies.

During the critical experiment that would rid David Banner of the Hulk,a spy sabotages the laboratory. Banner falls in love with the spy, Jasmin, who performs missions only because her sister is being held hostage by Jasmin's superiors. Banner and Jasmin try to escape from the enemy agents to rebuild their lives together, but the Hulk is never far from them.

An accidental overdose of gamma radiation causes a mutation in scientist David Banner's DNA: now whenever he becomes angry, he metamorphoses into a seven-foot-tall, 330-pound, mindless muscular green creature.

On the run again, Dr. David Banner is jailed for assault after interrupting a mugging. Blind attorney Matt Murdock enlists Banner's help in locating the muggers because he believes they work for his longtime foe, Fisk, the head of an international crime network. But David, afraid of public exposure, breaks out of jail as the Hulk. Tracking David down, Murdock reveals his own secret: His blindness came from a radioactive spill, and after developing his other senses so incredibly, he has become the amazingly athletic crime fighter called Daredevil. Fisk must now face off against Daredevil and the Incredible Hulk!

David and Carolyn marry in Hawaii and continue to work to find a cure for both their afflictions in a race against time.

On the run and presumed dead by the authorities, David Banner, using the name 'Benton', continues in his efforts to find a cure. He accidentally finds himself in the middle of a plot to kill a young, crippled girl so her unscrupulous relatives can inherit the family fortune.