- Name: Geiger Rock (ガイガーロック)
- Number: MRGR-2
- Height: 2 m
- Weight: 1.15 t
- Hardness: 10
- Weapons: Atomic Death Fork, Alpha Beam, Ankoku Zōei Ken (暗黒増影拳)
- Transformation: Space Crystal (Radioactive Material)
- Voices: Takuro Kitagawa (Gelvar, ep 20), Katsumi Suzuki (eps 21-22), Hideyuki Umezu (ep 30)
- With an evil intellect, he specializes in devising new strategies. He secretly schemes to become the leader of the Rock Lords. His Variable Hands can make machines. Can emit ionizing radiation from his body and can act as a spy by traveling through the earth with his spin drill.
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