Version 1
- Lady as Thomas
- Rosie as Percy
- Molly as James
- Danni as Gordon
- Emily as Henry
- Mavis as Toby
- Thomas as Lady
- Alfred the Holden B/12 as Diesel 10
- Bill & Ben as Splatter & Dodge
- Oscar the Grouch (From Sesame Street) as PT Boomer
- Elmo (From Sesame Street) as Mr. Conducter
- Abby Cadabby (From Sesame Street) as Lily
- Snuffy (From Sesame Street) as Burnett Stone
- Big Bird (From Sesame Street) as C. Junior
- Zoe (From Sesame Street) as Stacy Jones
- Ernie (From Sesame Street) as Patch
- Bert (From Sesame Street) as Mutt
- Cookie Monster (From Sesame Street) as Billy TwoFeathers
- Zoe Trent (From Littlest Pet Shop) as Bertie
- Pepper Clark (From Littlest Pet Shop) as Harold
- Snuil Nevla & Russell Ferguson (From Littlest Pet Shop) as Annie & Clarabel
Version 2
- Rosie as Thomas
- Rebecca as Henry
- Frieda as Gordon
- Emily as James
- Gina as Percy
- Henrietta as Toby
- Billy as Lady
- Donald and Douglas as Annie and Clarabel
- Toby as Henrietta (cameo)
- Tasha Stone as Burnett Stone
- Patch as Lily
- Lily as Patch
- Lady Hatt as Sir Topham Hatt