Mary Lou Helperman

Mary Lou Helperman (voiced by Debra Jo Rupp) Leonard's mother, and the teacher of his fourth grade class. She is a nice, lovable person who likes to inject humor into the fourth grade class. Leonard is somewhat embarrassed about his mom being the teacher and Mrs. Helperman sometimes likes to embarrass him although by the end of the year, she is trying to quit (as evidenced in an early scene of the movie).