David Banner (Nick Nolte) takes the Gamma treatment himself and gains the ability to take on the properties of whatever he touches. He and Bruce (Eric Bana) fight, and the Army blasts them with a Gamma nuke, presumably killing them both. A year later, no one has seen Bruce but we find him dispensing medicine to impoverished people in a Latin American jungle. Government banditos arrive to take the medical supplies. Last lines: Bruce says in Spanish, "You're making me angry. You wouldn't like me when I'm angry."
Thanks, Craig F!