An alien vessel manages to break the earth defense systems. Captain Layton is sent to investigate and find the invaders. Together with friends from the planet Ganymed he discovers the enemies in a hidden underground city on earth.

A strange signal arrives on the Earth disturbing all communications, while an UFO appears above the Antarctic sea. Captain Alex Hamilton is sent with his spaceship and crew to the space outside the Solar System to find the origin of that signal. They reach an unknown planet where a giant robot enslaved a whole population of humanoids by taking their psychic energies.