Black Cross Führer

The Black Cross Fuhrer is the supreme leader of the Black Cross Army and the primary antagonist of Himitsu Sentai Gorenger. He is a mysterious figure who seeks to dominate the entire world under his rule. He eventually returns as the main antagonist of Gokaiger Goseiger Hero 199 Great Battle, now going by the name the Black Cross King.

Himitsu Sentai Gorenger
The Black Cross Fuhrer stays hidden for most of the series, though he was often referred to as the "Machine Monster" for his seemingly invincible nature. Initially commanding the Black Cross Army's Masked Monsters directly, the Fuhrer later brought in his generals to command the monsters after their continued failures to defeat the Gorengers.

Eventually, the Black Cross Fuhrer is revealed to be an alien machine and the true form of the Black Cross Castle. After Commander-in-Chief Golden Mask revealed the location of the Gorenger's base, the Fuhrer attempted to destroy it. However, he was defeated when the Gorengers used their "Cassiopeia" Five Star attack against him.

Gokaiger Goseiger Hero 199 Great Battle
The Fuhrer eventually returned, using the hatred of past defeated Super Sentai villains to revive himself as the Black Cross King. He appeared before Warz Gill and the crew of the Gigant Horse to form an alliance with the Zangyack Empire, telling them that once he destroyed the Super Sentai, Earth would be theirs.

The Black Cross King later appeared before the Goseigers and Gokaigers. He revived three of the Super Sentai's past enemies, Brajira of the Messiah, Yogoshimacritein and Hades God Dagon to defeat the two Sentai teams. After the three were defeated, the King used the Ranger Keys he stole to create an army of past Super Sentai teams to defeat the Gokaigers and Goseigers. When the Keys were also defeated, the King grew giant, but was destroyed when the spirits of past Sentai created the Super Sentai Bazooka and fired it at him.

However, this was not the end of the Black Cross King. The King instead shifted to his true form, the Black Cross Colossus, and once again revived Brajira, Yogoshimacritein and Dagon, as well as Brajira's other forms, Kireizky, Chirakasonne, Hades God Ifrit and Hades God Cyclops. In his fortress monster form, the Black Cross King easily overpowered Gosei Great, Gosei Ground and GokaiOh. However, the spirits of the past 33 Super Sentai mecha appeared to fight alongside the Gokaigers and Goseigers. After his army of revived villains was destroyed, the Black Cross King was finally destroyed himself when GokaiOh combined with the Gorenger's ship, Variblune, to create Goren GokaiOh and destroyed the Black Cross King with a Gokai Hurricane Cassiopeia.

Kamen Rider x Super Sentai x Super Hero Taisen
The Black Cross King eventually returned as a member of Dai-Zangyack. He later appeared as a member of the Shocker-Zangyack Alliance and, in the final battle, he could be seen fighting VulEagle and GingaRed.

Trivia

 * The Black Cross Fuhrer also appears as the main villain in the manga adaption of Gorenger, Shin Himitsu Sentai Gorenger Gokko.
 * The Black Cross Fuhrer is similar to the Great Leader of Shocker from Kamen Rider, in that he is the mysterious leader of a terrorist organization bent on taking over the world. His initial appearance in Goranger also bears a resemblance to the Great Leader.