At
first, Banner would transform into the brutish gray Hulk only at sunset,
and revert to human form at dawn. Eventually, his changes into the
childlike green Hulk came to be triggered by the release of adrenaline
when he was intensely excited, no matter what time of day. The green Hulk
possesses little of Banner's memory and intelligence, and is easily
enraged -- making him a menace to society.
Since
Banner's initial transformation into the Hulk, military forces commanded
by the implacable General Thadeus "Thunderbolt" Ross -- father
of his late wife, Betty -- have hunted him continually.
