One night, a fireball is seen falling from the sky. Tom Mura and his assistant/photographer Liz learn that the shooting star has landed in the northwest. They drive to the location and discover a yellow saucer. Convinced that the ship belongs to Rodak, Tom goes for help while Liz stays to take some photos. A Lugo Man appears from inside the saucer and captures her. Tom returns with the police, only to see the saucer explode and find Liz walking in a trance. Mikko and his mother Tomoko visit the planetarium, where he and other children are learning about shooting stars. All of a sudden, Rodak’s image appears on the planetarium “sky”. He tells of his plans to conquer Earth, because it is the most beautiful planet in the universe. In the confusion to leave the planetarium, Mikko is separated from his mother. Tomoko is followed by a sedan and is captured by four Lugo Men! While Mikko is asleep, Tomoko enters his room and takes the whistle. She blows the whistle many times. Thinking it to be an emergency, Gam, Silvar, and Goldar all respond. Mikko is startled and rushes outside to see his mother confronted by all three robots. She is frightened until Mikko explains the use of the whistle. All agree that it was a mistake. The next day Mikko goes to his father’s office at United Press International and tells him that he left a tape recorder running in the house. As Mikko’s mother calls Rodak for instructions, every word is being recorded. Mikko and Tom come home and accuse Tomoko of being an imposter. Realizing that she has been trapped, she turns into a Lugo Man and disappears through a wall. Rodak informs the world that his latest monster Zandosis (Frenix) is draining all the sound waves from the air and that a silent world will soon be a dead world.