A cruel Roundhead Colonel is on the trail of royalist sympathizers, but unaware of his daughters royalist sympathies. When she falls into a love triangle with Cavalier Edward Beverly and Roundhead officer Captain Sylvester the stage is set for double crossing and derring-do.

A pirate ship, fighting in 1588 on the side of the Spanish Armada, suffers damage and must put into a village on the British coast for repairs. The village is small and isolated and the Spanish convince the villagers that the English fleet has been defeated and that they, the Spanish, are now their masters. This results in the villagers' sullen cooperation, but rumors and unrest begin to spread and soon the Spanish pirates find themselves facing a revolt.

A group of ruthless pirates attack a 17th Century Huguenot settlement on the Isle of Devon in search of treasure and will stop at nothing to obtain it.

Archaeologists discover the final resting place of a boy king, removing the remains to be exhibited in a museum. By disturbing the sarcophagus they unleash the forces of darkness. The Mummy has returned to discharge a violent retribution on the defilers as the curse that surrounds the tomb begins to come true. One by one the explorers are murdered until one of them discovers the ancient words that have the power to reduce the brutal killer to particles of dust.

Blackmailing a young couple to assist with his horrific experiments the Baron, desperate for vital medical data, abducts a man from an insane asylum. On route the abductee dies and the Baron and his assistant transplant his brain into a corpse. The creature is tormented by a trapped soul in an alien shell and, after a visit to his wife who violently rejects his monstrous form, the creature wreaks his revenge on the perpetrator of his misery: Baron Frankenstein.