Mona Hatrock is a one-time character of the episode, "The Bedrock Hillbillies", featured in the fourth season of the original series, The Flintstones. She was Jethro's great-great grandmother who was painted in a picture by a famous artist.
Mona is a slender cavewoman with fair skin, black eyes, black eyebrows, a large nose, a goofy smile with goofy redneck teeth, and gray hair with a white bone on the bob. She wears a purple and black spotted loin-cloth dress and a teeth necklace.
- "The Bedrock Hillbillies" (only appearance)