Fourth installment in the Kamen Rider series. A plane crashes in the Amazon rainforest, leaving young Amazon (Daisuke Yamamoto) stranded without his parents. Soon adopted by an Incan tribe, Amazon becomes a wild child, living off the land. However, Amazon's idyllic existence is cut short when Gorgos, the Ten Faced Demon, massacres his village, slaughtering everyone except himself in search for the powerful "GiGi Armlet", which gives the bearer fantastic power. Elder Bago,…