Star Musketeer Bismark

Fuente: AniList

Bismark, a huge robot invented by the best scientific experts on earth, is being stored in one of the Galilean satellites of Juniper, Ganymede! In order to protect the peace of the earth, four youngsters are chosen by the federal government to get Bismark and fight against Deathcula, an evil power in the universe, who contrives to seize the control over the solar system.