Best movies like Undersea Kingdom

Martians come to Earth to build an H-bomb strong enough to blast Earth out of orbit so that Mars can be moved into its place in closer proximity to the sun. Super-scientist Larry Martin, inventor of the first stratospheric-flight spaceship as well as a jet-powered personal flying suit with helmet, is called upon by the government to investigate ramped-up UFO reports occasioned by the Martians' spaceships. The Martians, meanwhile, led by Marex, engage a renegade earth scientist and a gaggle of gangsters to help them steal supplies, operate a menacing robot, and build their bomb. This movie serial in 12 chapters was originally planned as a sequel to "Radar Men From The Moon" with Commando Cody as the hero but at the last moment the main characters' names were changed and all other references to that serial removed from the script.

Searching for the lost world of Atlantis, Prof. Aitken, his son Charles and Greg Collinson are betrayed by the crew of their expedition's ship, attracted by the fabulous treasures of Atlantis. The diving bell disabled, a deep sea monster attacks the boat. They are all dragged to the bottom of the sea where they meet the inhabitants of the lost continent, an advanced alien race that makes sailors their slaves.

An ex-convict tries to connect with the daughter who doesn't even know he exists.

Two deep-sea divers, known only by their nicknames of "Three-Time" and "Forty-Fathoms," find that no place on earth is big enough for both of them at the same time, even the bottom of the ocean. All day long they fight to salvage sunken gold at forty fathoms deep in the ocean, and all night long they fight over dames. This situation continues even when they both go to work for Helen Young, the owner of a tug-boat and a salvage business.

A nosy reporter (Nugent) befriends the dumb Coughlin and pushes the Governor to commute his sentence. Now, Coughlin can ride his family's pride and joy in the Kentucky Derby. BUT, the mean old Warden cancels all paroles--and the idiot decides to escape (even though he's only got 10 more months to serve). So, the reporter has a hunch and goes to see if he can find Coughlin--and the Warden deputizes him!! At this point you might wonder if the boy will make good and win the big race

Three earthlings visit the planet Mongo to thwart the evil schemes of Emperor Ming the Merciless.

The Daily Clarion hires detective story writer Steve Colt to investigate the deaths of a group of scientists working on an atomic rocket development project. Behind the killings is fortune teller Sombra, a spy from an Asian country intent on world domination, who is determined to pilfer the atomic rocket by luring workers from the project to her parlor and killing them with black widow spider venom when they refuse to cooperate.

Pulp hero "The Spider" seeks to destroy all criminals. In this serialized adventure, he battles The Octopus, who intends to replace the government of the United States.

This 15-chapter serial pits Batman and Robin against The Wizard, who uses a device that allows him to control machinery to hold the city hostage.

A young mechanic gets a job with a small airline, which he helps win a mail contract. A rival airline plots to destroy it in order to get the contracts for itself.

Prior to the United States' involvement in World War II, the masked vigilante Spy Smasher fights Nazi agents operating within the US, led by the treacherous sabotage leader codenamed The Mask.

Survivors of a sinking ship are rescued by Captain Nemo and his submarine crew. They are taken to an underwater city where they may spend the rest of their lives.

During WWII, when an allied bomber is shot down over Germany, the five surviving crew are captured but cleverly escape detention after learning German secret information and knocking out a Nazi major. With the angry major in hot pursuit, aided by military personnel, Gestapo agents and Hitler-loyal citizens, the five wend their way across perilous Germany, intent on reaching the UK with the secrets they have learned.

Two rival newspapers are engaged in a circulation battle, complicated by the fact that a vicious gangster inserts himself into the middle of it. Also complicating matters is that one newspaper's editor and circulation director are competing for the affections of a pretty blonde reporter.

Four flying G-Men protect America against enemy spies; one of the four assumes the identity of The Black Falcon, to befuddle the saboteurs even further.

A madman sets out to destroy a group of Chinatown merchants.

A rogue submarine captain pulls together a misfit crew to go after a sunken treasure rumored to be lost in the depths of the Black Sea. As greed and desperation take control on-board their claustrophobic vessel, the increasing uncertainty of the mission causes the men to turn on each other to fight for their own survival.

Dick Tracy's foe for this serial is the crime boss and Masked Mystery Villain The Spider/The Lame One and his Spider Ring. In the process of various crimes, including using his Flying wing and sound weapon to destroy the Bay Bridge in San Francisco and stealing an experimental "Speed Plane", the Spider captures Dick Tracy's brother, Gordon. The Spider's minion, Dr. Moloch, performs a brain operation on Gordon Tracy to turn him evil, making him secretly part of the Spider Ring and so turning brother against brother.

The heirs of Anton Benson are searching Bensonhurst for hidden gold; they are joined by a reporter, a gangster...and a masked fiend known as The Iron Claw.

Larry Willis and Bill Wane are security guards who ride in the back of Banks Co. armored trucks. When they barely avoid a robbery, they return to headquarters, where their boss John Hale introduces them to detective Tom Sheridan, who will be working with them to uncover a new gang of robbers.

A team of two-fisted insurance investigators (one of whom disguises himself as The Masked Marvel) endeavor to discover and thwart the loathsome saboteur Sakima.

During the Second World War a British schoolteacher working in Denmark is caught up when the Germans invade.

The wicked Blue Meanies take over Pepperland, eliminating all color and music. As the only survivor, the Lord Admiral escapes in the yellow submarine and journeys to Liverpool to enlist the help of the Beatles.

When the ancient continent of Mu sank beneath the ocean, some of its inhabitant survived in caverns beneath the sea. Cowboy singer Gene Autry stumbles upon the civilization, now buried beneath his own Radio Ranch. The Muranians have developed technology and weaponry such as television and ray guns. Their rich supply of radium draws unscrupulous speculators from the surface. The peaceful civilization of the Muranians is corrupted by the greed from above, and it becomes Autry's task to prevent all-out war, ideally without disrupting his regular radio show.

Government agents try to thwart smugglers, while some sort of plot unfolds, about a hidden treasure revealed by cursed coins.

Before the outbreak of WWII, Nazi sympathizers plot to undermine America.

A cult of Hindu tiger worshippers and a gang of Western outlaws try to cheat a young woman out of rich mines that belong to her.

Reporter Brenda Starr (Joan Woodbury) and her photographer Chuck Allen (Syd Saylor) get involved in a search for the loot from a payroll robbery. Cliffhanging action and adventure and a fair amount of comic relief follow them at every turn.

A movie serial in 13 chapters: Some swampland becomes valuable, and various factions squabble over ownership of it.

Having served a prison sentence for robbery, Pete Carver decides to go back for the hidden loot. But someone is on his trail.

Six friends, all hoping to become aviators, are to graduate the next day from the United States Naval Academy. When the officer of the day becomes sick, Tommy Winslow has to take his place, while the others go out and celebrate.

Number 10 in Monogram's series of 24 "Range Busters" westerns, Crash Corrigan, Dusty King and Alibi Terhune, the Range Busters,enlist in Teddy Roosevelt's Rough Riders during the Spanish-American War, but are mustered out and sent to Wyoming to clean up a cattle-rustling situation that is affecting the Army's meat supply. Arriving in North Butte, Crash's home town, they all get separate jobs. Jane Blanchard, a reporter from the Denver Daily, also arrives in town in search of a story, and is posing as a waitress. They learn that Jeff Miller is behind the huge combine of rustlers, but Miller also learns that they are the Range Busters and are on his trail. He and his henchmen engage the out-numbered Crash and Alibi in a fight, but Dusty stampedes a large herd of Miller's stolen cattle into the midst of the fray.

A 20 part 2-reel Western film serial.

A modern-day tale of gangsterism and revenge. After a notorious mobster murders a Jewish tailor and is let off for the crime, a band of outraged high-school students turns into vigilante crusaders hell-bent on punishing the wrongdoers. Memorable pre-Code moment: the students torturing a gangster by dangling him over a pit filled with rats.

On the night before he sails in search of the steamship Arcadia's sunken gold, Paul Sinclair (Bruce Bennett)meets Madeliene Nielson (Anita Louise) in a San Francisco nightclub. On the second day at sea, Madeliene turns up as a stowaway. While diving and searching for the sunken gold, off the Phillipines, Paul discovers that a foreign-country submarine has been laying mines in order to completely cut off the Phillipines from American protection.