Dark Horror

Dark Horror (暗黒ホラー) was an evil organization and a hybrid demonic-alien cult, serving as the villainous faction in the anime All-Star Gaiking, led by the Death Cross Four Kings and their ruler Darius the Hellbourne, though the latter would not appear in the series itself and only do so afterwards in the movie Tatsura vs. Hellbourne, when the organization was mostly dismantled. Its membership was composed of a mix of demons and aliens from the planet Zela. It would later be revealed that Dark Horror was a subsidiary to a much larger Incubus Faction known as the Sindicate of Moonless Night, which Darius was also leader of before being murdered and replaced by his son, the Incubus King.

Origins
As far back as six thousand years ago, before the Ancient War, the alien race of the planet Zela known as Zelans came into contact with humanity on Earth and seeing their proseprity and power, began a trading relationship with them, which was ended abruptly due to the escalation of the War. While many Zelans left Earth to avoid causing an interplanetary conflict, some stayed, particulary in the Underworld, with the ambition to make the Earth a colony under the rule of their homeplanet. The Forbidden God Darius offered the now-rogue Zelans a deal and allowed them to join the Incubus Faction to fight in the War in the favor. Since then, for the next millennia, what little remained of the Faction became a haven for the Zelans and created a small hybrid race of Demon-Zelans.

Darius the Hellbourne
The Great Emperor of Dark Horror, revered by his followers as "Darius the Great", he exercised absolute authority over the entire organization, even to the Four Kings. However, he was mostly absent during the organization's battles against Gaiking and lent authority to the Four Kings in his absence, since he took a human disguise under the name "Yoshima Kuroi" and became Prime Minister of Japan, so that he could manipulate the Japanese government, through the People's New Party, which he is a founder and secretary-general of, and individuals like Muneichi Yazaki are members of, and connections with the Washizu Group, and purposefully disorient the actions of the Taimanin, which Darius considered to be a greater threat than Sanshirou Tsuwabuki.

However, the death of many of his organization's members, including all of the Death Cross Four Kings, forced Darius's hand to strike himself and make haste of his plans. This culminated in the crisis that unfolded in the Seishu Academy, the creation of Redzone and De Szark, which Darius deemed to be the "strongest fighter in Yomihara" and the "most powerful demonic kaiju" respectively, and defeat in the Battle of Sendai by the Taimanin Tatsurou Akiyama, Yukikaze Mizuki, Rinko Akiyama, Shizuru Kousaka and Hanzou Hyakki, with the help of Justice Alliance superhero Zark Albatrosa, the Grandwalkers and the same force that destroyed much of Dark Horror, Gaiking.

Death Cross Four Kings
The Death Cross Four Kings (デスクロス四天王) was the title given to the four military commanders of Dark Horror, subservient only to Darius. They came from a hybrid Demon-Zelan race and each controlled warships known as Grotectors to make artificial prtal vortexes to travel from the Underworld to Earth and back.
 * Desmont –
 * Asimov –
 * Dankel –
 * Killer –

Military
The fighting force of Dark Horror could be divided into three hierarchal sects:
 * Death Cross Knights (デスクロス四天王) – Commanders who carry out operations at the behest of their Generals, the Four Kings. Most were made up of Demon-Zeran individuals, but may also use pure Zelans from their homeplanet or other demons.
 * Dark Knights (暗黒騎士) – Equivalent to a non-commissioned officer, they featured reptile-like eyes and thick lips, and wore helmets. A higher version of the Dark Birdmen, the Dark Knights may lead the Dark Birdmen to conscript lower-class demons and turn them into kaiju.
 * Dark Birdmen (暗黒鳥人) – The soldier-class of Dark Horror, created as a result of the brainwashing of lower-class demons into their ranks.