- Name: Devil Rock (ガイガーロック)
- Number: MRGR-1
- Height: 2.1 m
- Weight: 1.05 t
- Hardness: 12
- Weapons: Club Deal, Beta Beam, Cosmo Kenpō, Corrosive Gas
- Transformation: Space Rock
- Voices: Shūichi Ikeda (Clay, ep 20), Hideyuki Umezu (ep 21), Kenichi Ono (ep 22), Taro Arakawa (eps 28, 30)
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