She was "His boy Elroy"

Lucille Bliss died on November 8, 2012. You most likely would not recognise her name but you would know her voice. Bliss was a very successful voice over actress. Ms Bliss' voice has been the voice of very memorable animated characters. Her voice was the voice of the title role of the first made for television cartoon Crusader Rabbit. Bliss also worked in animated films. She is the voice of one of the horrid step-sisters in Disney's "Cinderella" as well as in "101 Dalmations". Her real fame came from her television characters. She was the voice of Bam Bam Rubble and Elroy Jetson in the 60's and later was the voice of Smurfette.

Bliss a pioneer in telvision animation was born in New York in 1916 and later lived in San Francisco where she started working in radio dramas.. When she heard that Walt Disney was casting role for Cinderella she moved to LA and auditioned. Disney gave Ms. Bliss her Hollywood first job.
I'm an actress specializing in voices," Bliss once told a writer. "I don't like the term 'voice-over.' … You have to be an actor first, and then the voice.... You have to take acting lessons to learn how to act before you can speak."

Lucille Bliss died of natural causes at the age of 96 while living in an assisted living center in Costa Mesa, California.