Leader X hails from the planet Selector in the Andromeda Nebula, roughly two million light-years distant. Dispatched to Earth by unknown superiors, this alien transformed a minor criminal syndicate into the global terrorist force Galactor, paving the way for planetary conquest and colonization. An early, defining act involved genetically merging fraternal twins within their mother's womb, creating the singular entity Berg Katse, engineered for unwavering loyalty as Galactor's chief field commander. Typically, Leader X manifests as a nebulous purple shadow featuring a prominent blue, beak-like structure and red "head" markings, accentuated by piercing yellow eyes. This form usually appears centered within a circular yellow screen encircled by orange, cloud-like patterns, evoking a giant eye. Later sequel appearances depict a smaller, more colorful device. Its true nature is ultimately revealed as a biological super-computer constructed by Selector, composed of machinery and energy tubes. This mechanical composition grants potent regenerative abilities; a mere surviving fragment, after near-total destruction, reconstitutes itself into the more powerful and sinister Leader Z. The entity exhibits extreme arrogance, cruelty, and manipulativeness, viewing Earth's inhabitants as inferior and harboring specific hatred for the ISO's Mantle Project. While generally maintaining an alien, cryptic demeanor, flashes of anger—like abruptly terminating communications with Katse—betray occasional human-like emotional outbursts. Subordinates are treated as expendable tools; Katse is discarded when deemed useless, a fate shared by later replacements Gel Sadora and Count Egobossler. Learning of Selector's destruction in an interstellar war shifts its motivations from colonization to pure spite, driving a plan to annihilate Earth via a black hole device implanted at the planet's core. Leader X's arc spans multiple series. In the original, it primarily orchestrates Galactor remotely from a hidden base, designing mechas and directing Katse, rarely intervening directly except to eliminate Dr. Henjinman to protect its identity. After the Science Ninja Team thwarts the black hole plan and Katse commits suicide, X survives, attacks a cruise ship, and recruits Gel Sadora. Following Sadora's rebellion and death, X is seemingly obliterated in a base explosion. A surviving fragment regenerates into Leader Z for the sequel series. As Z, the entity rebuilds Galactor with Count Egobossler, initiating the Poison Apple plan to devastate Earth with an antimatter asteroid. Z ultimately eliminates Egobossler before being destroyed in a final battle, though a phoenix-like entity escapes the resulting black hole, leaving its ultimate fate ambiguous. English adaptations significantly alter the character. *Battle of the Planets* renames it "The Great Spirit" or "Luminous One," depicting it as ruler of the dying planet Spectra seeking resources. *G-Force: Guardians of Space* demotes it to "Computor," an alien consultant to Galactor. *Eagle Riders* rebrands it "Cybercon," retaining malevolence but adding grotesque elements like transforming a captive into a blue-skinned male named "Happy Boy" as mockery. Development history notes an initial concept where Leader X was an artificial intelligence fabricated by Katse to serve as a superior. This idea was discarded due to creative disagreements and the influence of *2001: A Space Odyssey*, leading to the finalized alien overlord. Plans for a direct sequel featuring the Science Ninja Team pursuing X into space were rejected but partially reworked into *Tekkaman the Space Knight*.