Donna Akersten

Samantha the Cat / The Sheep (voice)

Stuart Devenie

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

Mark Hadlow

Heidi / Robert / Barry the Bulldog (voice)

Brian Sergent

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

Ross Jolly

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

Peter Vere-Jones

Bletch / Arfur the Worm (voice)

Mark Wright

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

Danny Mulheron

Heidi the Hippo (uncredited)

Jay Snowfield

Killer man (uncredited)

Doug Wren

Bletch (voice) (uncredited)

Peter Jackson

Audience Member in the Theater (uncredited)

Fane Flaws

Musician Frog (voice, uncredited)