The Black Cross Führer is an alien being who came to Earth from a star within the vicinity of the constellation Cassiopeia. His purpose on Earth was to conquer it, having created the Black Cross Army with minions and Masked Monster androids, for this goal and purpose.
The Black Cross King initially leads attacks in secret through wearing a cloaked white hood from the initial attacks until the arrival of Volcano Mask General Magman, when he reveals his true form. The Black Cross Fuhrer usually holds back within the Black Cross' headquarters, leading the Masked Monsters and hearing of their schemes, or later hearing the schemes and aspirations of the generals who work for the Black Cross on his global conquering campaign. Prior to this, the Gorenger and even Commander Gonpachi Edogawa attempt to find out what he really is without any success.