Basically a travelogue featuring footage of Angkor Wat (in Cambodia) shot by a couple of explorers in the WWI years, with additional footage shot on a set in Hollywood by George M. Merrick.
A ghostly and deadly dinner party, which at first turns out to be an elaborate staging of a new play for the benefit of a Broadway producer, becomes a true mystery when the players start to go missing.
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.
An ex-vaudeville actor is working as the assistant to a doctor who has Frankenstein aspirations. The ex-vaudeville actor kills the doctor and decides to assume the identity of the dead physician.
A black voodoo priestess comes out of the Louisiana swamps to take revenge on the white plantation owner she believes killed her husband. The old conjure woman Mandy returns with her daughter Chloe to their bayou home after fifteen years. Chloe was too young to remember much about the bayou, but once Mandy had been a famous voodoo priestess in these parts. But after the whites lynched her husband Sam, she took her little girl & moved away into the Everglades. She seems to have gone a little mad in the intervening years & has returned swearing a belated vengeance against the murdering white folks.
Out of the Mystic Temples of Old India crept this terrible Monster to wreak vengeance of the Hindu Gods. One by one its victims fell with not a trace of the bloody assassin.
British Egyptologist, Professor Morlant, seeks immortality through the power of a jewel buried in the tomb of an Oriental idol. Upon his death, Morlant returns to earth to seek vengeance upon those who removed the jewel from his grave.
Rival newspaper reporters Pat Morgan and Ted Rand find themselves unraveling the mystery behind the death of a millionaire philanthropist who fell from his penthouse balcony. When it is discovered that the plunge was not an accident, the building's residents come under suspicion. Soon, the body count begins to mount as three more murders occur by strangulation.
The heirs to a family fortune are required to attend a seance at the spooky old family mansion. However, throughout the night members of the family are being killed off one by one.
When a movie actor is shot and killed during production, the true feelings about the actor begin to surface. As the studio heads worry about negative publicity, one of the writers tags along as the killing is investigated and clues begin to surface.
When legendary hunter Bob Rainsford is shipwrecked on the perilous reefs surrounding a mysterious island, he finds himself the guest of the reclusive and eccentric Count Zaroff. While he is very gracious at first, Zaroff eventually forces Rainsford and two other shipwreck survivors, brother and sister Eve and Martin Towbridge, to participate in a sadistic game of cat and mouse in which they are the prey and he is the hunter.
In Haiti, a wealthy landowner convinces a sorcerer to lure the American woman he has fallen for away from her fiance, only to have the madman decide to keep the woman for himself, as a zombie.
Ruth Earlton has come home to her ancestral mansion to claim her inheritance. Accompanied by her boyfriend, she discovers that her father died suddenly under suspicious circumstances. Now it's her turn, as her deranged and relentless uncle targets her for death with the help of his wife and son, plus a very unhappy ape.
Infamous burglar "The Bat" commits a daring jewelry theft despite heavy police presence. Soon after, a bank theft occurs, which may be the work of the criminal as well. Meanwhile, Cornelia Van Gorder has various people arrive at her old mansion, including her niece, Dale, a bank employee, and police detective Anderson. When guests start turning up dead, Cornelia begins to suspect that The Bat may be lurking around the estate.