Version 1
- Thomas as Rocko
- Bertie as Spunky
- Percy as Heffer Wolfe
- Toby as Filbert Shellbach
- James as Ed Bighead
- Daisy as Bev Bighead
- Emily as Dr. Paula Hutchinson
- Donald as Chuck Chameleon
- Douglas as Leon Chameleon
- Henry as Really, Really Big Man
- Diesel as Peaches
- Rosie as Shelia the Fox
- Caroline as Gladys the Hippo Lady
- Scruffey as Earl the Dog
- Gordon as George Wolfe
- Molly as Virginia Wolfe
- Oliver as Grandpa Wolfe
- Edward as Peter Wolfe
- Mavis as Cindy Wolfe
- Sir Handel as Ralph Bighead
- Spencer as Mr. Dupette
- Rusty as Gordon the Foot
- Stepney as Buddy Gecko
- Duck as Dad Elf
- Luke as Little Elf
- Stanley as Mitch
- BoCo as Fran the Newscaster
- Skarloey as Bloaty the Tick
- Rheneas as Squirmy the Ringworm
- Duncan as Slippy the Slug
- George as Mr. Smitty
- Billy as Wild Pig
- Toad as Captain Compost Heap
- Elizabeth as the Widow Hutchinson
- Duke as Frank Hutchinson
- Bill and Ben as the Beaver Paramedics
- Lady as Elkie
- Bulgy as the Sani-Tour Bus Driver
- Peter Sam as Pinky the Appendix
- Bertram as the Hopping Hessian
- Nelson as Mr. Noway
- Belle as Alicia Kangaroo
- Millie as Claudette Wallaby
- Dennis as Flecko the Fly
- Isabella as Madame Doreeno
- Smudger as Mortimer Khan
- Salty as Captain Jack
- Hector as Wallace the Elephant
- Cranky as Heffer's Real Dad
- Hank as Gib Hootsen
- Hiro as Dr. Katz
- Murdoch as Spike Hammerhead
- Arry as Buff
- Bert as Dick
- Rocky as "Big" Biff Benderhaus
- Patrick as Mr. Icck
- Horrid Lorries as the Blood Brothers