Dai-Satan

Dai-Satan (lit."Great Satan") is the ultimate evil of Zyuranger. Taking the appearance of a massive disembodied head; Dai-Satan first appeared 170 million years ago when he bestowed great magical powers on Queen Bandora of the Fairy Tribe to lay waste to Earth, manipulating her through her grief over the death of her son Kai. After Bandora was sealed away by the Guardian Beasts, Dai-Satan was banished by Ultimate Daizyujin but managed to split him into his three lesser aspects.

In the series, Dai-Satan was first mentioned in episode 5 when Bandora invoked his name to gain his blessing for Dora Sphinx's operation. Bandora would later invoke his power again when using a ritual to allow for the fairy boy Ryota to reawaken vengeful warrior Burai in the present.

Dai-Satan finally appeared in episode 30 when Bandora used Satan's Tower to summon her master to Earth so that he could upgrade Zombie Franke into Satan Franke who immobilized both Daizyujin and Dragon Ceasar with his poison spray. However, after the Zyurangers completed a ceremony to restore Daizyujin's true power and form, Satan Franke was killed by Zyutei Daizyujin and Dai-Satan was driven back into space by Ultimate Daizyujin.

In the finale, Dai-Satan brought Bandora's son Kai back to life so that he could pilot Dora Talos. After Bandora used her magic to make King Brachion sink into the ground, she used Satan's Tower to revive her master and helped to recreate Dora Talos, who Kai used to severe Daizyujin's left arm and half of Dragon Caesar's tail.

Dai-Satan was finally killed by Ultimate Daizyujin in the finale just before doing away with Kai and Dora Talos forever.