The Sleeper Strikes! Captain America has failed in stopping the Red Skull from awakening a fourth Sleeper robot (which can become intangible and is destroying strategic US locations with its power blasts) but he has succeeded in retrieving the sonic key needed to control the Sleeper. As Cap and Agent 13 try to track the Sleeper on its path of destruction, the Red Skull sends his troops to try and stop the heroes from destroying the robot, an effort which is ended in failure. Captain America and Agent 13 locate the sleeper and with the sonic key manage to coax it above ground where Cap battles it. It's a losing fight because Cap is unable to cause the powerful robot any harm, however Agent 13's powerful feelings for Cap have an effect on the sonic key causing it to shatter and the fourth Sleeper to disintegrate, defeating it once and for all and saving the United States from further destruction at its hands.
