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)