When delusional madman Roxor kidnaps a scientist in hopes of using his death ray to achieve world dominance, he is opposed by Chandu, a powerful hypnotist and yogi.

In the 1800s, a stormy love relationship develops quickly between a young medical student and a woman believing herself to be the daughter of his scientist uncle, the student having never heard of her before their chance encounter and both unaware that she is the result of the scientist's illegal experiments with artificial insemination..

A burglar is recruited by the French Surete to help find his kidnapped girlfriend, who has been kidnapped by a deranged White Russian to impersonate the missing Princess Anastasia Romanoff while under his hypnotic spell.