Boss (ボス Bosu) is an evil Kamen Rider that appeared in the Kamen Rider OOO S.I.C. Hero Saga story, Kamen Rider OOO: OOZ powered by the Core Medals of the 6 Greeed created by Shocker, being the Shocker Greeed, Gel-Shocker Greeed, Destron Greeed, G.O.D. Greeed, Garanda Greeed and the Delza Greeed. He was transformed by the Great Leader.