Scottish archaeologist Angus Flint discovers an odd skull amid the ruins of a convent that he is excavating. Shortly thereafter, Lady Sylvia Marsh returns to Temple House, a nearby mansion, far earlier than expected. At a party in the village, Angus meets Lord James D'Ampton, who has just inherited his family's land right next to Temple House. Angus learns of the D'Ampton Worm, a huge dragon-snake that an earlier D'Ampton killed by cutting it in half. (There's a pretty catchy rock-folk song that tells the D'Ampton Worm legend.) As people begin disappearing and acting strangely over the next few days, the skull is stolen from Angus's room, and the watch of a missing person is found in a cavern that was the legendary home of the D'Ampton worm. Angus and James discover that there was an ancient cult that worshiped the worm as a god, and they theorize that the creature somehow survived its destruction, but it was trapped inside the cavern. The remainder of the movie shows Angus, James, ...

In a strange grotto deep in the bowels of the earth a coffin uprights itself, dances, then opens, and out steps a demonic magician with skeletal face, horns, and cape. He wraps two women (who appear to be in a trance) in fabric, levitates them, and causes them to burst into flames and disappear. As he gathers their ashes in a pitcher a Good Spirit [a young woman who resembles Peter Pan] appears, shakes her head No, and reveals the "souls" of the two women in a secret compartment deeper within the cave. The Good Spirit vanishes in a puff of smoke. The magician then produces 3 glass bottles on pillars, takes them downstage close to the camera, and reveals 3 tiny women in them; one woman beats a tambourine while the other two sway. The magician pours ashes (?) into the bottles, but the Good Spirit reappears and makes these trapped figures disappear in a flash, angering the magician...

Charlie dreams he is in the stone age. There King Low-Brow rules a harem of wives. Charlie, in skins and a bowler, falls in love with the king's favorite wife, Sum-Babee. During a hunting trip the king is pushed over a cliff. Charlie proclaims himself king, but Ku-Ku discovers the real king alive. They return to find Charlie and Sum- Babee together.