- “For once, I concur.”
Moonrock is an inventor who enjoys inventing things, though they don't always work as intended.
Moonrock is slender with fair skin, black hair and wears white glasses. He also wears a red bowtie, a grey-blue and black colored shirt that hangs down to his knees and his shirt is held together by a white bone.
- While several of Moonrock's inventions were impressive, others were creations that had already been invented in the Modern Stone Age, such as drums, transmitters and certain vehicles.
- Moonrock along with Bamm-Bamm and Penny made a cameo appearance in the 1995 series, Johnny Bravo, in the 2004 episode "A Page Right Out of History".
- Another glasses-wearing friend of Pebbles and Bamm-Bamm who also went by the name of Moonrock appeared in the episode, "Dawn of the Disposals" from Yabba-Dabba Dinosaurs, although it is unknown if they are intended to be the same character.