A giant asteroid is heading toward Earth so some astronauts disembark from a nearby space station to blow it up. The mission is successful, and they return to the station unknowingly bringing back a gooey green substance that mutates into one-eyed tentacled monsters that feed off electricity. Soon the station is crawling with them, and people are being zapped left and right!
Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.
A hunchbacked caretaker presides over a forlorn mansion inhabited by the ghosts of his previous masters. An unbelieving trio (a doctor, his assistant and his niece) fail to heed the caretaker's warnings and are slaughtered horribly by the jealous occupants.
