A drug dealer on the run from the law meets an innocent young girl and her brother, and turns them into “cocaine fiends”.

Chandu consults his crystal ball and sees that Nadji, Princess of Egypt, is in danger. She is about to be sacrificed by the black magic cult of Ubasti. Headed for the magic island of Lemuria, he is shipwrecked , washed ashore and captured. He becomes invisible, escapes and after numerous detours is able to rescue the princess.

A doctor who has spent his career working on ways to revive the dead sees his chance to prove his theory by performing his procedures on a recently deceased dog.

Englishwoman falls for dude ranch cowboy but goes back to England when she thinks he's only pretending. But he follows her to England.

On the mystic island of Lemuria, the cult of Ubasti seek the Egyptian Princess Nadji to sacrifice so that their goddess Ossana, whose soul resides in Nadji's body, may be resurrected by Black Magic. Nadji is located in the Far East port of Suva, but shielded by the White Magical powers of Frank Chandler, an American raised by Eastern mystics who is also known as Chandu. When Chandu takes a voyage alone, however, the evil Voice of Ubasti is able to magically spirit her to Lemuria, where Black Magic reigns supreme. Chandu sets out in pursuit with his sister Dorothy, niece Betty and nephew Bob; but, shipwrecked on the magic island, Chandu finds his family also held prisoner for sacrifice while he is plunged into an endless maze of caverns beneath the evil temple, where both his mortal and magical strength seem rendered useless.

A crooked nightclub owner, pretending to go straight, is forced to kill a henchman when the latter tries to run off with the gang's latest haul.

On the eve of his execution, a vice-rackets bigshot recalls his various exploits in crimes such as abortion and white slavery, in which he frequently operated under an alias.

Gold mining cowboy western romantic melodrama (based on the story by Zane Grey) about a pair of cowboys who find a gold mine in "Thunder Mountain", but have no money to develop it. One of the cowboys rescues a girl on a stagecoach and her grateful father agrees to finance them. Along the way, she pretends to fall in love with one of the cowboys. Thinking he is about to be very rich, he sets out, but upon arrival, he finds that a bad man has stolen the claim and started a town. There, everyone turns on him, including the girl, but luckily, another pretty girl, a barmaid (who is secretly in love with him), sticks by him, and he ends up in a climactic shootout on the mountain where the gold is stashed.

The plot revolves around a rivalry between sand-hog "Hard Rock" Harrigan (O'Brien) and his foreman Black Jack Riley. At the center of their conflict is their mutual affection for heroine "Andy" Anderson (Irene Hervey). But when the chips are down and Riley is trapped in a tunnel cave-in, it is Harrigan who comes to the rescue.

Complications ensue when a young married couple pretend to be something they're not.