Superman - The Mechanical Monsters

The Mechanical Monsters (1941)

In this story, a scientist uses a robot to steal money and gems. Later, Lois and Clark are at a museum exhibit when the robot appears again, stealing the gems. Lois climbs into the robot's back and is taken to the scientist's lair. Superman comes to the rescue and fights the scientist's army of robots. The scientist captures Lois and threatens to kill her, but Superman saves her and stops the scientist. In the end, the robots are destroyed, the jewels are recovered, and the scientist is arrested. Clark compliments Lois on her story, and she thanks Superman for her survival.