Danny Mulheron
Heidi the Hippo
Donna Akersten
Samantha the Cat / The Sheep
Stuart Devenie
Sebastian / Dr. Quack / Daisy the Cow / Sandy the Chicken
Mark Hadlow
Heidi the Hippo / Barry the Bulldog / Robert the hedgehog
Ross Jolly
Harry the Hare / Dennis the aadvark / Abi the Contortionist / mr.big the whale / Pekingese / Vietnamese Gophers
Brian Sergent
Wynyard the Frog / Trevor the Rat / F. W. Fly / Jim the frog / Chuck the frog / the Spider / vietnamese Gophers
Peter Vere-Jones
Bletch / Arthur the Worm / Baker / Paperboy / Announcer
Mark Wright
Sid the Elephant / The Cockroach / Luie the Dog / Guppy the fish / Poodle / Bartender / Crab
US release
New Zealand release
Japan release
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