Ultraseven: S1 E26 - Super Weapon R1 Ultraseven
R1, a weapon made for attacking other planets to protect earth, was fired. The target was Planet Gyeron, a planet observed to have no form of life. The experiment was successful, but Dan was not happy for excessive strategic development of weapons by human being. Before long, there was a shadow flying to earth from Planet Gieron. It was Star Bem Gyeron, mutated from the radiation of R1!