Melissa Altro
Melissa Altro (born May 16, 1982) is a Canadian voice actress from Montreal, Quebec. Prior to having a career in voice acting, Altro guest-starred on a 1994 episode of the YTV/Nickelodeon series Are You Afraid of the Dark?. Altro also provides the voice of Gretchen in the Teletoon/Disney XD animated series Camp Lakebottom. Altro is perhaps best known for voicing Muffy Crosswire on the PBS Kids animated television series Arthur (1996-present).