Her two biggest gigs couldn't have been more contrasting. She was the official voice of Disney's Snow White, the original Disney Princess; and she voiced almost every female character in the show South Park. As Snow White, you can hear her most prominently in the deleted scenes in the now out of print DVD.
She also gave new life to Daphne Blake in the Scooby Doo animted films of the late 90s. What was once a bland character was now all of a sudden full of layers and depth and that's all because of the dimension that Mary Kay Bergman put into the character. Scooby Doo in Zombie Island marks the debut of Bergman voicing Daphne and it is awesome.
Voicing Batgirl in the straight-to-DVD feature Batman: Sub-Zero, one of the Silly Girls in Disney's Beauty and the Beast andSpider-Man fan favorite Gwen Stacy in the Fox Animated series Spider-Man: The Animated Series are also very notable and unforgettable roles. She will be missed greatly by many and all.
In the following song from the South Park movie, Bigger, Longer and Uncut, take note on how she portrays each of her characters with a unique take. She's the voice of all of the mother characters, and what an awesome singer she was.