Irving Pichel has organized a cruise where he can experiment on people trying to synthesize the compound from the endocrine glands that makes people maniacs and inject them into non-volunteers because ..... well, he never explains why he does this. His subjects include his nephew, Lyle Talbot, Julie Bishop, Sheila Bromley and others, but not Eddie Holden. Holden is better remembered for playing a chipmunk in BAMBI, but here he's doing a fake Swedish accent and trying not to be as funny as El Brendel. He may even succeed. I do not urge you to see this in an effort to make your own call.
This is supposed to be based on the first story Jack London ever sold It's also the first production of Ben Judel's Producers Distributing Corporation, which became PRC. For that company, it's slightly below par.