Superman: The Mechanical Monsters (1941)

Following the robbery of a local Metropolis bank by a huge hulking robot that can also fly like an airplane here referred to as a "mechanical monster", the upcoming jewel exhibition seems a likely next target. Clark Kent and Lois Lane have been sent to cover the exhibition for The Daily Planet newspaper when sure enough the "mechanical monster" shows up, wreaks havoc and flies off with the jewels...only this time Lois Lane has stowed herself away amongst the stolen cargo as well in an attempt to unravel this unusual mystery.