Great Emperor Zero is a body double who poses for the real Zero, using his lance to execute traitors and failures alike. When Amazon arrives to Garanda's base, Zero negates the GiGi Armlet's powers with his lance as the Helium Bomb is installed. However, once the GaGa Armlet is fused to the GiGi Armlet, Amazon become immune to Zero's power as he loses his arm to the Kamen Rider before he gets impaled by his own pit trap.
Behind the scenes
Great Emperor Zero is portrayed by Hirohisa Nakata (中田 博久 Nakata Hirohisa?).