The Black Cross Führer is the supreme leader of the Black Cross Army and the main antagonist of Himitsu Sentai Gorenger. He was often referred to as the "Machine Monster" for his seemingly invincible nature. He returns as the primary antagonist of Gokaiger Goseiger Super Sentai 199 Hero Great Battle, now calling himself the Black Cross King.
The Black Cross Führer first appears in Himitsu Sentai Gorenger as the supreme leader of the Black Cross Army, possessing numerous supernatural powers and incredibly high intelligence. His identity was a secret even among his generals, though eventually, his true form is revealed. In reality, he was not even human, but rather an alien machine and the alternate form of the Black Cross Castle. He was defeated when the five Gorengers combined their powers and launched their "Cassiopeia" Five Star attack.
199 Hero Great Battle
During the events of Gokaiger Goseiger Super Sentai 199 Hero Great Battle, he reincarnates using the hatred of defeated Super Sentai villains and forms an alliance with Zangyack in order to exact his revenge upon all the Super Sentai and those who support them. He revives several of the Sentai warriors' enemies, Brajira, Yogoshimacritein, and Dagon, to assist him and battle against the Gokaigers and Goseigers. He later gains the Ranger Keys of the past 33 Sentai teams and uses it to turn the Super Sentai into his personal army. After his Ranger Key Clones are defeated and their keys are recovered, he grows into a giant, only to be defeated by the Super Sentai Bazooka created by the spirit of all the Super Sentai teams.
Despite this, he survives and reveals his true fortress monster form, the Black Cross Colossus, as well as reviving Brajira and his various forms, Dagon, Cyclops, Ifrit, Yogoshimacritein, Kireizky and Chirakasonne. He easily overpowers GokaiOh, Gosei Great and Gosei Ground. However the spirits of the past 33 giant mecha appear to fight him and his revived servants alongside the Gokaigers and Goseigers. After the Gokaigers are given the Gorenger's Greater Power, the Variblune, they combine GokaiOh and Variblune to create Goren GokaiOh, and destroy the Black Cross Colossus with the Gokai Hurricane Cassiopia.
Super Hero Taisen
He returns again in Kamen Rider × Super Sentai: Super Hero Taisen alongside other past foes of the Super Sentai as a part of Dai-Zangyack. In the final battle of the movie, he can be seen fighting VulFalcon and GingaRed.