Captain America rescues his girlfriend Connie Ferrarri from rampaging alien criminals and delivers her safely to Steve Rogers’ door—without letting her catch on to his secret identity. He heads over to Avengers Mansion to find out what is going on with these alien interlopers….
As David Ferrari breaks into Hydra headquarters, Nick Fury, watching via surveillance camera, finally has confirmation that Ferrari is alive….
At the Mansion, Cap is accosted by monsters which are driven off by a scientist named Sarron wielding a weapon he calls a dimensional oscillator. Sarron explains that the aliens are prisoners sentenced to Earth and that he has mounted a larger version of his device atop the Statue of Liberty’s torch—but he needs Cap’s shield as a power source to drive off all the aliens. A suspicious Cap agrees but after the shield is placed in the machine Sarron reveals himself as the villain Mercurio the Fourth-Dimensional Man and intends to escape Earth alone. As the machine threatens to wreck Miss Liberty, Cap rips his shield out and the feedback apparently destroys Mercurio. Cap heads back to the fight against tyranny….