An ancient Egyptian priest named Imhotep is revived when a British archaeological expedition finds his mummy and one of the researchers accidentally reads an ancient life-giving spell. Imhotep escapes from the field site and searches for the reincarnation of the soul of his lover.
Making a delivery to a mysterious mansion in a rainstorm, radio salesman Hank Martin is knocked out when a suit of armor topples on him. Upon awakening, Hank finds himself in the time of King Arthur. At Camelot Castle, Hank uses a cigarette lighter and his skill with a lasso to save himself from being executed as a demon. Hank so impresses Arthur that the king orders him to joust with one of his knights to save the life of Princess Alisande.
British estate agent Renfield travels to Transylvania to meet the mysterious Count Dracula, who is interested in leasing a castle in London. After Dracula enslaves Renfield and drives him to insanity, the pair sail to London together and Dracula, a secret vampire, begins preying on London socialites.
The mysterious Count Orlok summons a happily married real estate agent to his castle, located up in the Transylvanian mountains, to finalise a terrifying deal.