• Jason as Caillou
  • Great Bear's Son as Leo
  • Chander as Mr. Washington
  • Great Bear as Boris
  • Lua as Doris
  • Susanna as Rosie
  • Professor Johnson and Professor MacKay as Jason and Jeffrey
  • Nessie as Clementine
  • Eric Tan Tannenbaum as Billy
  • Dr. Lorna Jenkins as Grandma
  • Wise Shaman as Grandpa
  • Yeti as Jim (both were mean, but later good)
  • T-Rex as Mr. Hinkle
  • Female T-Rex as Nancy (Mr. Hinkle's Sister)
  • Chiros as The Janitor (AKA The Toilet Man)

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