Samantha the Cat / The Sheep (voice)

Sebastian / Dr. Quack / Daisy the Cow / Sandy the Chicken (voice)

Heidi / Robert / Barry the Bulldog (voice)

Wynyard the Frog / Trevor the Rat / The Fly (voice)

Harry / Dennis / Abi Bargwan / Mr. Big / Pekingese / others (voice) (uncredited)

Bletch / Arfur the Worm (voice)

Sid the Elephant / The Cockroach / Louie the Fish (voice)

Heidi the Hippo (uncredited)

Killer man (uncredited)

Bletch (voice) (uncredited)

Audience Member in the Theater (uncredited)

Musician Frog (voice, uncredited)