The Great Boss of Black Satan (in Japanese: ブラックサタン大首領 Burakku Satan Dai Shuryō 26) is the leader of Black Satan and the main antagonist of the first half of Kamen Rider Stronger. He controls the Satan Bugs (in Japanese: サタン虫 Satan Mushi) that allow Black Satan to control others.
He is yet another incarnation of the Great Leader.
The Great Boss eventually attempted to replace General Shadow with Dead Lion, causing the General to desert Black Satan. Stronger also discovered the Great Leader's hiding spot and went to confront him, destroying him with a Stronger Electro Kick.
- As with most incarnations of the Great Leader, the Great Boss of Black Satan was voiced by Gorō Naya (In Japanese: 納谷 悟朗 Naya Gorō).