Donna Akersten as Samantha the Cat / The Sheep (voice)

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

Mark Hadlow as Heidi / Robert / Barry the Bulldog (voice)

Brian Sergent as Wynyard the Frog / Trevor the Rat / The Fly (voice)

Ross Jolly as (voice) (uncredited)

Peter Vere-Jones as Bletch / Arfur the Worm (voice)

Mark Wright as Sid the Elephant / The Cockroach / Louie the Fish (voice)

Danny Mulheron as Heidi the Hippo (uncredited)

Jay Snowfield as Killer man (uncredited)

Doug Wren as Bletch (voice) (uncredited)

Peter Jackson as Audience Member in the Theater (uncredited)