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- Arthur's Mom as Ms. Frizzle
- Pal as Liz
- Arthur as Arnold (both names start with A) - Pluto
- Buster as Carlos - Uranus
- Brain as Tim - Saturn
- Fern as Dorothy Ann - Jupiter
- George as Ralphie - Mars
- Francine as Keesha - Venus
- Muffy as Phoebe - The Moon
- Sue Ellen as Wanda - Mercury
- D.W. as Janet - Neptune