Hiding in the unoccupied penthouse apartment, and learning the secret of how the Yellow Mask had used it as his hideout, Clark and Major Campbell have a close call when Heller’s men return. Superman stashes Campbell safely into a closet, and makes short work of the thugs. New secrets in the apartment are learned when radio signals are heard, broadcasting in morse code. What does it mean?
Across town, we find the Yellow Mask, with Heller, trying to send a message to their thugs. Will the lack of responce tip them off? Will the captive Lois Lane still be valuable to them as a prisoner?
Heller boasts to Lois about his plan for building an army of mechanical men. Behold, the 10 foot tall mechanical man, and bringer of mass destruction. To the horror of Lois, he describes details of his first bombing raid, using the flying robot. Can anything be done to stop the machine?