However, his village is massacred by the Ten-Faced Demon Gorgos, who searches for the powerful GiGi Armlet to take over the world with it.

Befriending Professor Kousaka's nephew and niece, Amazon learns of the GiGi Armlet's true nature and ultimately defeats Gedon, then the Garanda Empire.

Gedon (ゲドン) is the evil organization based in the Amazon before moving to Japan, bent on world dominion and fueled by human blood.

Led by the mysterious "Ruler" and stationed underground in a trap-filled base, the Garanda Empire also uses Beastmen as their monsters.

The Kamen Rider Amazon movie is a theatrical version of episode 16, depicting Gengoro Beastman's attempt to execute Garanda's Tokyo Sea of Flame plan.