A robot flies into a scientist's secret lair and unloads a pile of cash into a vault. The robot is controlled completely from the scientist's command center, and many robots similar to it are lined up along the walls of the lair. The front page of the Daily Planet reports the "mechanical monsters" robbery right alongside an announcement for the display of 50 million dollars of the world's rarest gems at the local museum.

Later, as Lois Lane and Clark Kent are covering the museum's exhibit for the Planet, a mechanical monster lands in the street outside. The police pelt it with machine gun fire as it marches towards the museum, but the bullets bounce harmlessly off. Museum visitors, including Clark and Lois, flee as the monster marches towards the jewels and begins loading them into an opening in its back.

While Clark phones the Planet from the nearest phone booth, Lois climbs into the monster's back, just as the monster leaves the museum and takes off into the sky. Clark emerges from the booth, notices Lois gone, and says, "This is a job for Superman!" He goes back into the phone booth and changes his clothes, emerging in his classic red-and-blue costume.