- Name: Double Rock (ダブルロック)
- Number: MRGR-3
- Height: 1.83 m
- Weight: 1.20 t
- Hardness: 9
- Weapons: Plasma Thunder mace, Bomber Punch, Heat Beam, Freeze Beam
- Transformation: Coal
- Boasts a barbaric personality and monstrous strength to match. Even his allies make fun of him behind his faces.
- Ironically, Double Rock appears in the anime in blue-green colors similar to his GoBots counterpart Sticks 'N Stones, while Sticks 'N Stones was animated in Double Rock's black colors.