 David Banner, a research scientist who is haunted by the death of his wife whom he couldn t save in a car accident is researching how to tap the hidden reserves of incredible strength all humans have. While investigating episodes of people who have displayed such strength under times of great stress, he discovers that each one coincided with a solar flare spike of gamma radiation. Convinced by the link, Banner decides to put it to the test when he deliberately doses himself with gamma radiation. Unknown to him however, the machine was modified to give a far higher dose than he anticipated. While there was no immediate effect, that soon changes when on the way home, he forced to change a tire in the rain. He injures himself and the result anger and frustration transforms him into a massively powerful green giant, the Hulk. He eventually changes back and, now he must investigate what did this thing and face the consequences.