Donna AkerstenSamantha the Cat / The Sheep (voice)
Stuart DevenieSebastian / Dr. Quack / Daisy the Cow / Sandy the Chicken (voice)
Mark HadlowHeidi / Robert / Barry the Bulldog (voice)
Brian SergentWynyard the Frog / Trevor the Rat / The Fly (voice)Ross JollyHarry / Dennis / Abi Bargwan / Mr. Big / Pekingese / others (voice) (uncredited)
Peter Vere-JonesBletch / Arfur the Worm (voice)
Mark WrightSid the Elephant / The Cockroach / Louie the Fish (voice)
Danny MulheronHeidi the Hippo (uncredited)Jay SnowfieldKiller man (uncredited)
Doug WrenBletch (voice) (uncredited)
Peter JacksonAudience Member in the Theater (uncredited)Fane FlawsMusician Frog (voice, uncredited)
