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)