The last and only shown kaijin of the original Geldam. A crab/bat monster. It's destroyed, seemingly alongside Kamen Rider 1, when they crash into each other in the air and explode. Later, a remodeled version, with yellow boots, is rebuilt by Gel-Shocker. Episodes 78-80, 97
The Shocker Riders are Gel-Shocker's versions of the Kamen Riders, composed of six members with yellow glove and boots, and different colored scarfs. In addition to the standard abilities of Kamen Rider 1, they also had micro missile launchers installed in their fingers. They're all destroyed by Kamen Rider 1 and Kamen Rider 2's Rider Wheel.