- Fireman Sam as The Cat in the Hat
- Elvis Criddlington as Norval the Fish
- Station Officer Steele as Joey
- Trevor Evans as Horton the Elephant
- Penny Morris as Sarah Hall-Small
- Dilys Price as Pam-I-Am
- Norman Price as The Grinch
- Sarah as Cindy Lou Who
- James as Sam-I-Am
- Bella Lasangne as The White-Tufted Floozle Bird
- Bentley the Robot as Vlad Vladikoff
- Rosa as Little Cat C
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