Fan CastingThe Incredible Hulk: Lead The Charge!

When asked to join several other heroes to go on a diplomatic mission, Bruce agrees, only because peace is the goal. They attend several events where they meet with heroes from other nations, such as the canadians Alpha Flight and Captain Brittain. Eventually they are asked to go to Russia. Since Sam Wilson hasn't officially been announced as the new Captain America yet, they get someone else to take up the role in Russia, who wouldn't cause a fuss, John Walker. They meet with the Winter Guard, Russian superheroes, but once there Bruce hulks out out of the blue, killing one of their companions. The situation is incredibly tense, and Bruce can feel how close he is to losing it again. What the hell is causing it?