Top 15 Sci-Fi Movies Must-See Released in 1940

The owner of a coal mining operation, falsely imprisoned for fratricide, takes a drug to make him invisible, despite its side effect: gradual madness. See more about The Invisible Man Returns / IMDB / YouTube

A mad scientist develops an aftershave lotion that causes his gigantic bats to kill anyone who wears it. Find out about The Devil Bat / IMDB / YouTube

An attractive model with an ulterior motive volunteers as guinea pig for an invisibility machine. More about The Invisible Woman / IMDB / YouTube

Dr. Sovac transplants the brain of a gangster into his professor friend's body to save his life, but there is a side effect that causes a dangerous split personality. Find out about Black Friday / IMDB / YouTube

A mad scientist working in the South American jungle miniaturizes his colleagues when he feels his megalomania is threatened. Details on Dr. Cyclops / IMDB / YouTube

Tale of prehistoric survival and love between a male and a female belonging to opposing tribes that happen to be at slightly different stages of evolution. Details on One Million B.C. / IMDB / YouTube

A ravaging plague has struck the Earth threatening no less than global extinction. This alien disease is believed to be the evil spawn of Ming, the merciless Emperor of Planet Mongo. The world's only hope now rests with Flash Gordon. Get info on Flash Gordon Conquers the Universe / IMDB / YouTube

A physician on death row for a mercy killing is allowed to experiment on a serum using a criminals' blood, but secretly tests it on himself. He gets a pardon, but finds out he's become a Jekyll-&-Hyde. Check out Before I Hang / IMDB / YouTube

A medical researcher visits the deserted home of a pioneer in cryogenic science who disappeared 10 years earlier and finds him frozen in ice but still alive. Read about The Man with Nine Lives / IMDB / YouTube

A newspaper publisher and his Korean servant fight crime as vigilantes who pose as a notorious masked gangster and his aide. Get info on The Green Hornet / IMDB / YouTube

A wealthy publisher uses a disguise and calls himself the Green Hornet to fight crime in his city. Get info on The Green Hornet Strikes Again! / IMDB / YouTube

The corpse of a hobo with a $50,000 money belt helps Brass and Gabby crack a cell of fifth columnists bent on sabotage. Look into Murder in the Air / IMDB / YouTube

Sgt. Renfrew and Constable Kelly go aloft to search for a plane missing with a shipment of gold from the Yukon Mine Company. Inventor Speavy has devised a power ray which disrupts electrical impulses, and Morgan and his gang of crooks has brought in Prof. Lewis to increase the ray's range, telling him he's helping the government develop this new weapon. Speavy spills . See more about Sky Bandits / IMDB / YouTube