A mysterious object attacks and destroys any ship or submarine. Submarine 707 has the mission to search for that mysterious object, when summoned by a whale to follow it. The whale leads them to the world of Mu. But on their way they meet the mysterious object. They find out , it is Commander Red Silver, who had attacked the world of Mu to get Mu's magma sources. Submarine takes up the battle to defeat Red Silver and save Mu, and the world for that matter.
勝生真沙子
as Chaika (voice)
富田耕生
as Yohei Hayami (voice)
檜山修之
as Goro Kusaka (voice)
うえだゆうじ
as Kenji Mizuhaya (voice)
鈴置洋孝
as Red Silver (voice)
飛田展男
as Haru (voice)
久川綾
as Kuneiwa (voice)
大友龍三郎
as Moguro (voice)
松本保典
as Senta Umino (voice)
