Deep inside the Cube, desperately trying to shut down the facility’s Gamma reactor before it can overload and irradiate most of Nevada, The Avengers and their ally Doc Samson find themselves blocked from their goal by The U-Foes.
Iron Man makes a quick leap to the reactor and manages to initiate its cool-down protocols, while Thor hurls his hammer at Ironclad. The Scarlet Witch uses her hex powers to shut down Vapor’s powers, but the villainess regains them in time to escape from a mystical restraint cast by Doctor Strange. X-Ray attempts to attack the witch, but is refracted around her harmlessly by her reality warping mutant abilities. As X-Ray reforms, Iron Man knocks him unconscious with a powerful blast from his chest-mounted Unibeam. Vector attempts to attack Thor, but his efforts are easily shrugged off, with a single glower from the Thunder God being enough to send the U-Foes’ leader fleeing from the combat. Thor continues to deal blow upon blow to Ironclad, but it is finally the Wasp’s bio-stings that level the powerhouse. The team then unites to finish off the stunned, but still deadly Vapor.
In the aftermath of the battle, S.H.I.E.L.D. forces retake the Cube, and the Avengers interrogate the Armadillo to attempt to learn the whereabouts of The Leader. Their questions are answered for them, as a beam of Gamma energy is reported being launched from the penthouse of a casino hotel on the Las Vegas strip. Iron Man realizes that the beam is set to collide with an approaching Stark satellite, which will then transmit the Gamma rays across the planet, creating a world of Gamma monstrosities.
The Avengers board the Quinjet and fly to Las Vegas. En route, they read an additional Gamma signature, which they identify as the Incredible Hulk! Doctor Strange, in his astral form, speaks to the behemoth and convinces him to aid the Avengers in their upcoming fight.
Reaching Las Vegas, the Avengers quickly and easily locate the Leader and his henchmen, the Abomination and the Absorbing Man. Thor leaps into battle with the Abomination but is quickly tackled through the penthouse window down to the streets outside by The Absorbing Man. The Leader activates a battle suit, but is quickly knocked down by Iron Man, and then teleported out of the suit by a surprising use of the Witch’s hex power. The Hulk arrives on the scene at this point, destroying the Leader’s battlesuit entirely, but with it, the controls for his Gamma Ray Projector.
While Hulk and Wasp battle the Abomination, The Scarlet Witch and Doctor Strange continue to engage the Leader. Iron Man flies into orbit, forced to destroy his own satellite in order to avoid the gamma-irradiation of the planet.
The Hulk hurls the Abomination with such force that the monstrous villain is actually thrown clear of Las Vegas, with the Hulk bounding off to pursue. The Wasp blasts the Leader with a bio-sting, knocking him unconscious. On the streets below, the Absorbing Man distracts Thor by hurling a bus at a group of civilians, using Thor’s rescue of the innocents as cover for his escape.