The Generalissimo of Badan is the true leader of the Badan Empire, appearing as a giant skull in the sky. It first appears at the end of the Kamen Rider ZX special, and later returns as the main antagonist of Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai.
He is yet another incarnation of the Great Leader. He was voiced by Gorō Naya, as with most incarnations of the Great Leader, in the Kamen Rider ZX special and by Tomokazu Seki in Kamen Rider Taisen due to Naya's death in 2013.
Kamen Rider ZX
The Generalissimo first appeared after Ambassador Darkness's death, revealing itself as the true leader of the Badan Empire. It disappeared after sneering at the ten Riders. Dr. Kaidō identified it as the energy of an evil spirit
Kamen Rider Spirits
In the manga, Kamen Rider Spirits, the leader is identified as Great Leader JUDO, JUDO has a Kamen Rider form called Susanoo, a golden version of ZX with the ability to transform into nine Shōwa Kamen Riders. He has his own language, which he can telepathically compel others to understand.
Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
The Generalissimo of Badan reappears in this film as the main antagonist, leading a Badan Empire comprised of the spirits of all of the previously defeated Kamen Rider villains and monsters. His goal was to open a portal on the surface world to the underworld to release his underworld army and allow them to invade Earth. After the portal was opened the Generalissimo revealed his true form as a giant skeletal dinosaur. He is defeated when the Ressha Sentai ToQger in ToQ-Oh fuse with Kyoryu Red in Gabutyra and Kamen Rider Den-O in Den-Liner, combining into ToQ-Oh Kyoryuzin Feat. Den-Liner and destroy the Generalissimo of Badan.