When an UFO delivers a metal-eating monster to the heart of Japan, Getter Robo and Mazinger Z are launched to combat the alien menace. Fighting individually, the space monster's metal-eating and acid-spitting abilities prove too much for Japan's super robot forces - only their combined might stands a chance against defeating it! But with Mazinger Z damaged, can Getter Robo defend against the monster long enough for its comrade to be repaired? And even with forces combined, can they defeat the monster before all of Japan is destroyed?
神谷明
as Ryo Nagare
キートン山田
as Hayato Jin
大竹 宏
as Boss
沢田和猫
as Shiro Kabuto
富田耕生
as Dr. Saotome
吉田理保子
as Michiru Saotome
柴田秀勝
as Kenzo Kabuto
西尾徳
as Musashi Tomoe
野田圭一
as Tetsuya Tsurugi
中谷ゆみ
as Jun Honoo
