As the Nazis mine a tunnel in the East River, Cap and Bucky shut down a Fifth Column that is attempting to sap American morale to resist Hitler's goons so that New York City can be captured.; Cap and Bucky take the fight to a group of Martians who have invaded Gotham City, intending to seize it, but Cap smells a rat when a Martian weapon turns out to be a German Lugar in disguise!; Morpheus decides to give Jefferson the nightmare of his life, but doesn't reckon with the Imp!; Roddy gets the surprise of his life when he sees another "Secret Stamp" captured by a group of Nazi spies, who have been ordered by Hitler to kill the Secret Stamp!