A-Bomb is eager to prove himself to an over-protective Hulk and finds an unlikely mentor in Red, but when Sauron and his army of dinosaurs begin to flood Earth with lava, A-Bomb finds himself facing a true trial by fire.

The Hulks join forces with Thor to stop Laufey and his army of frost giants from freezing the world solid, but a grudge between Red and Hulk might cost them victory.