The residents of a small town are excited when a flaming meteor lands in the hills, until they discover it is the first of many transport devices from Mars bringing an army of invaders invincible to any man-made weapon, even the atomic bomb.

In an effort to be able to afford expensive treatment for her gravely ill American husband, a retired German entertainer returns to the cabaret as Blonde Venus and catches the eye of a wealthy politician.

Jeff Wilson, the owner of a small circus, owes his partner Carter $10,000. Before Jeff can pay, Carter's accomplices steal the money so he can take over the circus. Antonio Pirelli and Punchy, who work at the circus, together with lawyer Loophole try to find the thief and get the money back.

An obsessed scientist conducts profane experiments in evolution, eventually establishing himself as the self-styled demigod to a race of mutated, half-human abominations.

In 19th century Paris, a maniac abducts young women and injects them with ape blood in an attempt to prove ape-human kinship but constantly meets failure as the abducted women die.

Aliens from Outer Space are slowly switching places with real humans -- one of the first being a young man about to get married. Slowly, his new wife realizes something is wrong, and her suspicions are confirmed when her husband's odd behaviour begins to show up in other townspeople.

While on a ship to Skagway, Alaska, Duke and Chester find a map to a secret gold mine, which had been 'stolen' by thugs. In Alaska to recover her father's map, Sal Van Hoyden falls in with Ace Larson, who secretly wants to steal the gold mine for himself. Duke, Chester, the thugs, Ace and his henchman chase each other all over the countryside—for the map.

After a young woman is coerced into prostitution and her brother framed for murder by an organized crime syndicate, retribution in the form of an ape visits the mobsters.

Stan and Ollie are mousetrap salesmen hoping for better business in Switzerland, with Stan's theory that because there is more cheese in Switzerland, there should be more mice.

When several women are found mutilated and murdered, the Paris police are baffled as to who the killer may be. All evidence points to Dupin, but soon it becomes apparent that it is someone (or something) stronger and deadlier than a human.

When bookseller Buzz cons Diana into thinking that his friend Stanley knows all there is to know about Africa, they are abducted and ordered to lead Diana and her henchmen to an African tribe in search of a fortune in jewels.

A series of strange, inexplicable, and increasingly frightening events takes place in Mosby Manor.

Explorer Paul Hoefler leads a safari into central Africa and what was then called the Belgian Congo, in the regions inhabited by the Wassara and the famous Ubangi tribes.

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).

Broke lion tamers travel to Africa to make a movie about Amazon women, from a distance.

Young Mary Rainey takes the reins of her deceased father's failing circus. With the help of the Inimitable Smiley Johnson, she hopes to bring fortune back to her ragtag band of ragged shoeleather performers.

Stan and Ollie play bumbling circus performers who inadvertently drive the circus into bankruptcy. The circus can't pay them their wages so they are given a gorilla and a flea circus as payment. Bedlam ensues.

A group of people find themselves trapped in a creepy mansion, complete with secret passageways, a mad doctor and a murderous gorilla.

Jacqueline Logan stars as Paula, a beautiful and fearless circus leopard trainer. Working hand-in-glove with the police, Paula joins a circus where several murders have occurred. Among the suspects is gorilla trainer Caesar (Alan Hale Sr.). (NY Times)

In 'The Circus Kid', Buddy, an orphan who runs away from a a harsh orphanage, joins Cadwallader's Circus.