The kids learn to see the world through the eyes of different animals when a careless Arnold loses Carlos's pet rat -- then turns her invisible!
Guest Cast
Lily Tomlin
voices Professor Fizzle
Nathan Fillion
voices Axle ValveStuck
Martin Short
voices Tony Tennelli
Catherine O'Hara
voices Aunt Tennelli
Jay Baruchel
voices Dr. Tillage
Birva Pandya
voices Jyoti
Lynsey Pham
voices Wanda
Matthew Mintz
voices RalphieCast Appearances
Kate McKinnon
voices Ms. Fiona Frizzle
Miles Koseleci-Vieira
voices ArnoldEpisode Discussion
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