While testing weapons in a small Northeastern, the Skrulls accidentally exposed the area to massive doses of gamma radiation. Banner was the only survivor, and he was transformed into a green behemoth. He was one of the many superhumans captured and enslaved by the Skrulls to fight in their arena as one of the many "competitors". Banner was given the name the Banner Beast. When Terrax, herald of Galactus, arrived on Earth, Banner combined his power with the Thing and killed Terrax. Banner was later seen trying to decipher the alien code of the weapons arsenal, when Quicksilver failed to open one door, Banner broke it, despite the danger of it being booby-trapped. Banner then found a device held in a force field cube, asking if this was what Morph was looking for. Morph confirmed this and was relieved, saying that this device might be capable of bringing Galactus down.
Later, the attacks started, the Thing, Colossus, and Banner Beast combined their strength, while Sunfire, Johnny Storm, and Ororo Munroe attacked from the air. The Banner Beast later tried using an anti-matter bomb and wanted to explode it next to Galactus, only to be knocked out by a wave from Galactus' hand.
When Galactus was driven away, the Banner Beast, among the many other heroes, started rebuilding their world after a century of slavery by the Skrulls.