Universal Studios made The Phantom Creeps (1939) as a twelve part serial. It gained a slightly wider audience ten years later when it was redistributed as an uncut film. It has a little bit of everything in it... Sci-Fi, espionage, chases, adventure, explosions, bad acting. The works.
Bela Lugosi plays Dr. Zorka, a mad scientist whose revolutionary inventions have piqued the interest of both the government and spies.
One notable creation is an indestructible robot, capable of inflicting catastrophic damage at his whim.
His colleague tries to persuade him to turn his secrets over, but Zorka refuses, planning to utilize them for his own purposes. He goes into hiding, then on the run as the authorities set to raid his laboratory. A pretty reporter gains interest in the case and goes as a stowaway upon an airplane that carries Zorka's wife amongst others.
Zorka fakes his own death in a car crash, and the same day his wife is killed in a plane crash.
This is the last straw, and Dr. Zorka begins to lose it, going on a rampage bent on world domination. Utilizing his various inventions in his plan, he puts on a de-visualizing belt that renders him invisible and better able to get into mischief.
The race is on to stop Zorka before it is too late. Car chases and plane pursuits abound (one shot using footage from the Hindenburg disaster). Time is running out...
The Phantom Creeps- movie trailer