Dexter was actually voiced by two different women. Christine Cavanaugh was the voice for Chickie Finster on Rugrats and the titular Babe in the 1995 movie. She stopped portraying Dexter on Dexter's Laboratory during the show's third season, in 2001. She was replaced by Candi Milo who voiced Dexter during the duration of the rest of the show. They also gave Dexter an accent because they were fitting into the stereotype that all well-known scientists have accents.
How Well Do You Remember the Names of the Characters From These '90s Cartoons?
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