An alien robot arrives to hypnotically enslave the people of Earth, but is stopped when it cannot hypnotize one old man, a blind man.; An American engineer ignores the warnings of locals and builds a road through a Gypsy-inhabited wood. One of the gypsies causes his steam shovel to attack him until he agrees to stop building.; A Martian criminal arrives on earth and switches bodies with a man, but the man's dog can still tell the difference between them, forcing the Martian to switch back.; An inventor with a nagging wife must prevent giant roots resulting from a witch doctor's curse from overrunning Africa. He then turns to inventing a device which will harness the power of his wife's voice.