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Hey Arnold! – Season 4, Episode 8: Full Cast & Crew Aired Sep 11, 1999 Kids & Family/Comedy/Animation
Grandpa returns back to school so he can graduate; Mr. Simmons gives the class an assignment to couple up and take care of an egg over the weekend to learn teamwork and responsibility. TV-Y Air Date: Sep 11, 1999 See TV Episode Details

Cast & Crew

All Cast Crew
Craig Bartlett Creator, Writer Steve Viksten Creator, Guest Voice, Writer Joe Ansolabehere Creator Spencer Klein Arnold Shortman Voice Jamil Walker Smith Gerald Johanssen Voice Francesca Smith Helga Pataki Voice Dan Butler Guest Voice Dan Castellaneta Guest Voice Sam Gifaldi Guest Voice Olivia Hack Guest Voice Tress MacNeille Guest Voice John Mariano Guest Voice Anndi McAfee Guest Voice Justin Shenkarow Guest Voice Lane Toran Guest Voice Christopher Walberg Guest Voice David Wohl Guest Voice Celia Bonaduce Writer Michelle Lamoreaux Writer