During the experimental detonation of a gamma bomb, scientist Robert Bruce Banner saves teenager Rick Jones who has driven onto the testing field; Banner pushes Jones into a trench to save him, but is hit with the blast, absorbing massive amounts of gamma radiation. He awakens later seemingly unscathed, but that night transforms into a lumbering grey form. A pursuing soldier dubs the creature a "hulk". Originally, it was believed that Banner's transformations into the Hulk were caused by sunset and undone at sunrise, but later, after Rick witnessed Banner turn into Hulk at daytime following a failed attempt by Ross' men to shoot the Hulk into space, it was discovered to be caused by anger. Banner was cured in "The Incredible Hulk" #4, but chose to restore Hulk's powers with Banner's intelligence. The gamma-ray machine needed to affect the transformation-induced side effects that made Banner temporarily sick and weak when returned to his normal state.