The Incredible Hulk #364

Direct

Scientist Phil Stearns tags janitor Bruce Banner with a deadly poison that is going to kill him in sixteen hours. Unfortunately, Bruce has no idea that this has happened. When Abomination arrives at the nuclear testing facility and has only puny Banner to fight, he zaps Bruce with gamma radiation making him change into the Hulk during the day. This turns out to be a really bad move as the Hulk pours toxic chemicals on Blonsky, severely disfiguring him. The Hulk apparently suffers a heart attack thanks to Stearns' poison.