The residents of a small town are excited when a flaming meteor lands in the hills, until they discover it is the first of many transport devices from Mars bringing an army of invaders invincible to any man-made weapon, even the atomic bomb.
To ensure a full profitable season, circus manager Brad Braden engages The Great Sebastian, though this moves his girlfriend Holly from her hard-won center trapeze spot. Holly and Sebastian begin a dangerous one-upmanship duel in the ring, while he pursues her on the ground.
In Victorian era London, the inhabitants of a family home with rented rooms upstairs fear the new lodger is Jack the Ripper.
