After Professor Kasuga is killed by fiendish aliens for plans to a super-rocketship, his children trek across Japan, protected by the second-oldest brother, Koji, who transforms into the super-cyborg, Silver Mask.
Overview：After Professor Kasuga is killed by fiendish aliens for plans to a super-rocketship, his children trek across Japan, protected by the second-oldest brother, Koji, who transforms into the super-cyborg, Silver Mask.
