The first film adaptation of Sir Arthur Conan Doyle's classic novel about a land where prehistoric creatures still roam.

Starry-eyed heiress Mary Astor yearns for a "cave man" who will treat her rough and make her like it.

Informed by her doctor that she is going blind, Carol Trent tearfully breaks off her engagement with Don Manning, hoping to spare him the stigma of a sightless bride. When Hughes catches up with her and demands an explanation, Astor pretends to have fallen out of love with him and further convinces him that she has turned into a shameless hussy.

The adventures of Oliver Tressilian, who goes from English gentry to galley slave to captain of a Moorish fighting ship.

When his son marries a woman whose mother is the madame of a brothel, a wealthy father in San Francisco disowns him. The newlyweds travel to the South Seas, where he gets a job on a plantation. The father sends an agent to the plantation to try to buy off his son's bride, but she won't go for it.

On a volcanic island near the Kingdom of Hetvia rules Count Dakkar, a benevolent leader and scientist who has eliminated class distinction among the island's inhabitants. Dakkar, his sister Sonia and her fiance, engineer Nicolai Roget have designed a submarine which Roget pilots on its initial voyage just before the island is overrun by Baron Falon, despotic ruler of Hetvia. Falon sets out after Roget in a second submarine and the two craft, diving to the ocean's floor, discover a strange land populated by dragons, giant squid and an eerie undiscovered humanoid race.

A Chinese wife returns to the American family she left behind in Southeast Asia and then moves in on her daughter's (Lupe Velez) beau (Lloyd Hughes).

A newly hired police chief vows to clean up a notoriously corrupt police department. When he is murdered, investigators find that there is no shortage of suspects, most of them being fellow cops.

Alice Kendall is the darling of her social set, the sons and daughters of millionaires, although Alice's mother has impoverished herself to provide Alice with the luxuries she expects as her right. Mom blows what's left of her fortune to provide the best trousseau that money can buy when Alice marries Fred Garlan, and then wishes Fred lots of luck. Now, Alice is trying to coax Fred into buying her a new sable coat while Fred is busily trying to borrow enough money to keep his business afloat.

Sir James Blake has retired from Scotland Yard so that he can assist his niece Hope and her friend Jerry in developing an apparatus they have invented. Sir James thinks that their invention has the potential to prevent wars, and plans to donate it to the League of Nations. But a gang of criminals led by the elusive "Scorpion" steals the device, and Blake and his associates must recover the invention and determine the identity of the "Scorpion".