The owner of a plantation in the jungle marries a beautiful woman. Shortly afterward, he is plagued by a strange voodoo curse which transforms him into a gorilla. But is his transformation real or is it all in his head?

A tough cop meets his match when he has to guard a gangster's widow on a train journey from Chicago to Los Angeles.

Vicious gangster Vincent Canelli pulls off a daring prison escape just moments before going to the electric chair, taking with him Peter Manning – a bank robber and cop killer who was to die right after him. Taking several hostages along, they try to get their hands on the loot from Manning’s robbery to finance their escape from the country.

In 1927 Hollywood, a silent film star falls for a chorus girl just as he and his paranoid screen partner struggle to make the difficult transition to talking pictures.

As novice detectives, Bud and Lou come face to face with the Invisible Man.

A veteran, Joe Hilton, returns from the war to find that his brother Jeffrey Hilton, a gangster, has been killed. His quest for revenge leads him to take over his brother's illegal operations but his sweetheart, Lynn Turner, persuades him to change his ways and return to the straight and narrow.

After several years of supporting parts, Victor McLaglen once more landed a leading role in Republic's City of Shadows. McLaglen plays Big Tim Channing, an ageing but powerful gangster who raises young newsboy Dan Mason as his own son. Upon reaching adulthood, Mason (John Baer) becomes a law student, with the covert (and illegal) help of Channing. Despite his checkered past, Mason opts for honesty when he falls in love with Fern Fellows (Kathleen Crowley). This decision ultimately spells the doom for Mason's mentor Big Tim.

Philo Vance is hired to write a true-crime mystery... but when the facts about an unsolved crime are about to be brought out into the open a murder takes place.

The boys are working at the local boxing arena where their friend, Jimmy Higgins, is boxing. During a crooked match Jimmy is killed. The boys seek out his older brother, Johnny, a former boxer who gave up the sport rather than go crooked, and help train him to get back in the ring. They try to get him a shot at the title, and when they do the same crooked gangsters that were behind Jimmy's death try to get Johnny to take a dive.

Research chemist Barnaby Fulton works on a fountain of youth pill for a chemical company. One of the labs chimps gets loose in the laboratory and mixes chemicals, but then pours the mix into the water cooler. When trying one of his own samples, washed down with water from the cooler, Fulton begins to act just like a twenty-year-old and believes his potion is working. Soon his wife and boss are also behaving like children.