- The Cat (in the hat): Louise Bardey
- Horton: Hakeem Haidar
- Gertrude McFuzz: Helen Bacon
- Gertrude Bird Girl: Rhiannon Bromley
- JoJo: Sammie Minchell & Ysobelle Thorpe
- Mayzie LaBird: Becky Buxton
- Mayzie Bird Girls: Rosy Bell & Lauren Poole
- Sour Kangaroo: Poppy Branch-Tarry
- Sour Supremes: Jess, Gabbi Green
- Mayor: Douglas Wood
- Mrs Mayor: Rosie Shaw
- General Gengis Khann Smitz: George Bound
- Wickersham Brothers: Liam McHugh, Pippa Hickey, Sam Aves, Alexei Hawkey
- Thinks: Jeorge Latter, Emma Hartfield
- Grinch: Liam Mchugh
- Whos: Nathan, Claudia, Safia, Lottie, Lola, Sammie, Ysobelle
- Cadets: Robert, Jonathan, Andrew, Shauna, Rakki, Summer
- Elephant Bird: Rocco