Goldar takes Mikko to his base, located deep in the heart of the active volcano Mt. Olympian. There Mikko meets Goldar’s wife Silvar, and Mathusam, the elderly, white-haired scientist. Goldar and Silvar are taken with Mikko and ask Mathusam to create a son for them in Mikko’s image. He grants their wish, creating “Gam”, a boy robot who can change to a rocket just like his parents. Mathusam also gives Mikko a supersonic whistle to call for help whenever he is in danger. One blast will summon Gam, two blasts will call Silvar and three blasts will bring Goldar the Space Avenger into action! As a show of force, Rodak sends his mechanical creature Molesaurus to Earth. Mikko returns to his parents’ home and learns his father Tom Mura has been assigned to cover the story. Tom boards a train, but suddenly the creature Molesaurus attacks from underground! The survivors of the trainwreck seek shelter. Mikko and his mother learn about the accident and wonder if Tom is still alive.