Hulk's history has been tampered with:
Neil Armstrong takes his small step onto the moon to see Hulk
battling Abomination. In ancient Egypt, Joe Fixit fights Sandman and
knocks the nose off the Sphinx. The robot containing Bruce Banner's
consciousness takes them through another time jump and Gladiator Hulk
lands on the deck of the Santa Maria ready to face Fin Fang Foom as
“Bruce's” memory starts to go awry from the evil Chronarchist's
schemes....
Meanwhile, 500 years later, the Gamma
Bomb is ready for testing but Bruce Banner is arguing with General
Thunderbolt Ross over safety measures as Betty Ross looks on and the
sinister lab assistant/Commie spy Emil Blonsky tries to steal Bruce's
secrets. Out at the bomb site, however, the Chronarchist Khotto is
tampering with the bomb while remaining in touch with his ally
Zarrko. But they are short of the temporal element because of Hulk's
actions in Arizona in issue #12 and don't have the control over the
bomb that they wish; Zarrko suggests that Khotto add his time-suit
components to the mix, assuring him that he (Zarrko) can take him
(Khotto) away in time....
Hulk defeats FFF by wrapping his tail
around his neck—and then Hulk and “Bruce” are pulled back into
the timestream with the robot falling to pieces from the experience.
This is their last chance to find the baddie....
At the test site, Bruce sees teenager
Rick Jones drive out onto the testing grounds and rushes out to
rescue him...Bruce hurls Rick into a ditch...the bomb goes off...Hulk
appears and hurls Banner into the ditch...the radiation
hits...”Bruce” uploads his consciousness into Banner...and Hulk,
with a second full dose of the gamma ray mutates into a bigger,
meaner, spike-covered monster....