With Karnak the Killer's war-making complex in flames behind them, the Metal Men await their extraction from Karnia. Though their mission was, largely, successful, the Metal Men did sustain one casualty... Platinum. While technicians work to effect repairs on Platinum, the enigmatic Mister Conan confers with the rest of the team. The Metal Men's creator, Doctor Will Magnus, has committed treasonous acts against the United States of America. Magnus, though, was able to escape the Metal Men in Karnia. Conan begins a media campaign designed to flush Magnus out of hiding, using Platinum's condition as the lure. The repair work on Platinum has actually already been completed. Strangely, though, Platinum does not revive. The Metal Men stand guard, around the clock, outside Platinum's room. While waiting for Magnus to show at the hospital, Conan receives word that Magnus has stolen a hydrogen bomb.

Magnus threatens to detonate the warhead, on an American city, unless he receives one billion dollars. Conan tracks Magnus to the Superstition Mountains. The Metal Men are sent in to get him.The team scales a treacherous mountain peak. Suddenly, their line is cut. Iron is quick to catch the team before they really begin to fall. Magnus' face appears before them, threatening more surprises, on their way to the top. A magnetic clamp closes on one of Iron's arms, holding him fast. When it becomes apparent that the team will not be able to free him, Iron severs the trapped hand. Incapable of hammering in their pitons with only one hand, Iron relinquishes the lead to Gold. Another booby trap nearly fells the team, as they progress ever higher up the mountain peak. A triggered avalanche also fails to dislodge the team from the mountain. Making their way up a narrow crevasse, the Metal Men quickly become aware that the walls are closing in on them.

Iron manages to keep the gap open, long enough for the team to reach the top. Almost immediately, the Metal Men plunge through a trap door, landing, unceremoniously, in the presence of their creator, Magnus. Leveling an energy weapon on the Metal Men, Magnus leads them to the hydrogen bomb. Sacrificing himself, Iron lumbers towards Magnus. Magnus incinerates Iron's arm and leg, but still Iron forges ahead. Iron crushes Magnus' weapon, along with Magnus' arm. Realizing that Magnus is actually a robot, Iron tears him to pieces. Despite the Metal Men's success in retrieving the hydrogen bomb, the American government, fearing the team's failure, had already paid the ransom money. Magnus has now acquired the capital to finance his nefarious schemes. The damage to Iron's body is repaired. Platinum has also revived. The Metal Men go to visit her, only to find Lieutenant McDonald, a police homicide detective, already there. McDonald has just proposed to Platinum, leaving her with an engagement ring.