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Doctor Tennelli
Dr. Tennelli
First Appearance Inside Ralphie
Family Ralphie Tennelli (son)
Mr. Tennelli (husband)
Unnamed father or father-in-law
Brian (brother or brother-in-law)
Voiced By Tyne Daly
Doctor Tennelli, voiced by Tyne Daly, is Ralphie's mother. She's a pediatrician, pulling that card to keep Ralphie home and in bed in "Inside Ralphie," despite his desperation to get to school. She seems to have an easy going and playful relationship with her son, rolling her eyes at his bad jokes. She appears in "Inside Ralphie," "Going Batty," and is seen in "Rocks and Rolls." Her husband is mentioned in "Gets Eaten", but he has never appeared on-screen.

Personality

Doctor Tennelli is very much like a normal, caring mother. She does look out for her son while raising him as a single parent and also have a busy work life of her own.

She seems to be mature and is respectful towards Ms. Frizzle. She knows that Ralphie and his class go on a lot of exciting experiments, but it's not known if she knows the intensity of them, whether its going back in time, shrinking and going inside the human body, or getting eaten.
The Magic School Bus Episode 03 Inside Ralphie Germs Part 110:40

The Magic School Bus Episode 03 Inside Ralphie Germs Part 1









The Magic School Bus Episode 03 Inside Ralphie Germs Part 211:44

The Magic School Bus Episode 03 Inside Ralphie Germs Part 2

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