Captain America is stranded above a vat of Adhesive X in Baron Zemo’s castle in Mexico. His muscles have locked up because of the effects of the Super-Soldier Serum and he is at the mercy of a giant artificial man called a Plastoid. Cap reaches into his utility vest and drops a concussion bomb into the vat; the monster takes the brunt of the blast and is destroyed—for now. Cap heads off in search of Diamondback….
Diamond, meanwhile, is upstairs with Free Spirit and they spy Baroness Zemo with Professor Wentworth, revealed as the feminist villain Superia. The two heroines leap at their targets but before they land a trap door opens up and swallows a surprised Baroness and Superia. Diamond wants to find Cap but Free Spirit rushes off in search of her enemy Superia. As it turns out, she locates Captain America, and after some awkward introductions and explanations, Cap enlists her to help him defeat the pursuing Plastoid, which they do by stretching a tripwire across the entrance and slicing its leg off….
Below in the dungeon, Baroness Zemo and Superia awaken to find themselves the prisoners of Zemo. He accuses her of scheming to betray him to ally with Superia; the Baroness protests she was deceiving her visitor in hopes of obtaining the enhancement process. Zemo is convinced that she truly loves him and is faithful and the two go off together. Moments later, Diamondback enters the dungeon and finds the imprisoned Superia. The villainess reveals that she knows Diamond killed Snapdragon who was working for the villainess, and tells her she can make restitution for her crime. Superia says that if Diamondback agrees to take Snapdragon’s place in her organization, the villainess will give her the cure for Cap’s muscular breakdown (which she discovered when she analyzed Cap’s blood in issue #391). Diamond, seeing the chance to save Cap’s life, is tempted….
The Zemos search the castle by monitor and discover Cap and Free Spirit in the clutches of the damaged giant Plastoid. Sensing victory, Zemo replaces his humanlike mask with the traditional Zemo mask and summons the children to witness his triumph. As the Plastoid is carrying Cap and Free Spirit to its master, Cap has her take a bomb from his utility vest and use it to blow off the monster’s arm, freeing her. He dispatches her to find Diamond. She locates Cap’s partner with Wentworth/Superia and tells her about Cap’s situation then turns to face her enemy. Meanwhile in the lab, the villain orders Cap hurled into the vat of Adhesive X in full view of the children. Cap seizes his grapple gun and swings over the vat but causes the monster to fall in. The huge splash splatters Zemo with the Adhesive and he rips off his mask, exposing his scarred visage to the kids. Trying to elude Cap, Zemo topples over the railing and Cap grabs him by the arm…. Upstairs as Free Spirit takes on Superia, Diamondback, balking at saving Cap because of what happened the last time (issue #230), returns and knocks out the heroine. She then agrees to Superia’s offer and the two leave together…. Cap tries to pull Zemo to safety but his muscles are going numb; the Baroness shoots him and he drops Zemo into the vat. Baroness Zemo leaps after her husband, both going to their seeming deaths….