In 1964–66, she took over the role of Pearl Slaghoople on the original series, The Flintstones, which was originally played by Verna Felton. Waldo reprised Pearl on two television films, I Yabba-Dabba Do! and Hollyrock-a-Bye Baby in 1993. She also played Judy Jetson in the crossover film, The Jetsons Meet the Flintstones.
- The Flintstones - Pearl Slaghoople and Additional Voices
- The Man Called Flintstone - Roberta, Ms. Soapstone
- The Jetsons Meet the Flintstones - Judy Jetson and S.A.R.A.
- I Yabba-Dabba Do! - Pearl Slaghoople
- Hollyrock-a-Bye Baby - Pearl Slaghoople
- The Flintstones: Bedrock Bowling - Pearl Slaghoople