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Questel was seen onstage by animator Max Fleischer, who was looking for an actress to provide the voice for his Betty Boop character. Questel's "Boop-boop-a-doop" routine, done in a style similar to the version Helen Kane created, while at the same time evoking something of the naughty allure of film star Clara Bow, was exactly what Fleischer wanted, and he hired Questel in 1931. She began as one of a number of actresses providing the character's voice, but soon took over the role exclusively.

From 1931 until 1938, Questel provided the voice of Betty Boop in more than 80 animated shorts, the longest run for any actress doing that voice. During the 1930s, she released a recording of "On the Good Ship Lollipop", which sold more than two million copies. In 1988, she reprised her role as Betty Boop in a cameo appearance in Who Framed Roger Rabbit, which was Questel's most extensive work for Disney; she had provided brief additional voices for some of Disney's earlier films. - Wikipedia