The class constructs a giant robot with help from brainy scientist Dr. Sarah Bellum, then takes a look inside Ralphie's nervous system.
Guest Cast
Lily Tomlin
voices Professor Fizzle
Will Arnett
voices Galapagos Gil
Sandra Oh
voices Dr. Sarah Bellum
Mae Jemison
voices Kathy K. Kuiper
Birva Pandya
voices Jyoti
Leke Maceda-Rustecki
voices Carlos
Lynsey Pham
voices Wanda
Gabby Clarke
voices Dorothy Ann
Mikaela Blake
voices KeeshaCast Appearances
Kate McKinnon
voices Ms. Fiona Frizzle
Matthew Mintz
voices RalphieEpisode Discussion
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