Crash Corrigan, a recent graduate of Annapolis, and Diana, a go-getting reporter, join Professor Norton for a search for the source of a string of earthquakes, Atlantis. They ride Prof. Norton's rocket submarine searching the sea and little Billy Norton, the professor's son stows away, of course. When they find Atlantis they are caught in a war between peaceful Atlanteans, note their white capes, and war-monging Atlanteans, note their black capes. After many harrowing moments for Crash, Diana, Prof. Norton and Billy, they barely get away with their lives when they escape a tower of Atlantis raised to the surface for the sole purpose of dominating or destroying the Earth (Which one depends on the compliance of the upper world dwellers.)

Jim and Connie's postwar New York building troubles keep Jim from working on his novel. Ex-WAC from Jim's army days Roberta moves in, further upsetting Connie but pleasing Jim's friend Ed. Tenant Charley, who marries tenant Eadie, loans money to Jim to help him keep the building, money which this Casanova obtains from rich widows.

When Temple's miners strike gold they send Jake to file the claim. Dana is in the Recorder's office and overhears. He and his men kill Jake and forge new deeds. Now owning everything Dana tries to kick the Temple group off their land. But Jack and sidekick Lucky are on hand and plan to help them fight back.

A physician in a small town suddenly finds himself the object of vilification and persecution when one of his patients commits suicide.

A gambler in need of cash plots a romance between his daughter and a wealthy Englishman. The daughter, however, has plans of her own.

The Millionaire Kid is young Tommy Neville whose wealthy parents, Thomas and Gloria Neville are preparing to fight it out in divorce court.Tommy runs away from home. The private detective assigned to watch him tells Mrs. Neville he has been kidnapped. She immediately suspects her husband. Meanwhile, Tommy is selling newspapers in another city. He is attacked by a bully, and is rescued by gangster Terry Mallon and his daughter Kitty. Unaware of his identity, they take him to their beach home. Reporter Breezy Benson is sent to interview Mrs. Neville about the divorce, and is fired when she won't talk to him. He meets Kitty at the beach and is intrigued by her. He meets her father, who is curious but not suspicious as news of the alleged kidnapping has not been reported.

On a cattle drive Hoppy, camp cook Windy, companion Lucky, and young Artie Peters encounter an eccentric professor. The professor professes to be searching for the evolutionary missing link, but in reality he is a cattle rustler who uses his dynamite to scatter the cattle in order capture some of them. Hoppy and Bar 20 guys ultimately capture the professor.

A government agent sets out to capture a gang of airmail bandits who use a death ray to blow planes out of the sky.

A Royal Canadian Mountie is assigned to bring in a criminal called "The Raven." The problem is that no one has ever seen him.

Funds are embezzled and a fur trapper is murdered. Rin Tin Tin to the rescue!

A cop is fired from the force and attempts to solve a string of truck holdups.

A rancher caught in the middle of a bank robbery shoots one of the robbers. However, the dead bandit turns out to be a former ranch hand who was suing him. The rancher is arrested for murder.

Tyler is a range detective whose brother stands accused of robbing a bank and murdering the bank president. To prove him innocent, Tyler must decipher his only clue, an unusual set of tire tracks.

A rodeo singer funds a little girl's operation with a show, on television.