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** = denotes CAP mainstage debut
| Horton the Elephant | Abbie Evans ** |
| Jojo | Hank Jones |
| Cat in the Hat | Margo Keller |
| Gertrude | Aurora Grooters |
| Mayzie | Charly Proctor |
| Sour Kangaroo (and Young Kangaroo understudy) |
Addison Tullis |
| Young Kangaroo (and Sour Kangaroo understudy) |
Addisyn Marvin |
| Mr Mayor | August Nau |
| Mrs Mayor | Lydia Davis |
| Grinch (and Mayzie understudy) |
Alison Keeler |
| Vlad Vladikoff | Jungle creature | Aidan Farrell |
| Yertle the Turtle | Jungle creature | Sydney Pride |
| Wickersham Brother | Jungle creature | Kinnick Lenihan ** |
| Wickersham Brother | Jungle creature | Karissa Lyons |
| Wickersham Brother | Jungle creature | Nick Meredith |
| Bird Girl | Jungle creature (and Cat in the Hat understudy) |
Corley Blackford |
| Bird Girl | Jungle creature | Ella Jacobs |
| Bird Girl | Jungle creature | Makalya Sengstock |
| Who | Jungle creature (and Horton understudy) |
Grace Corwin ** |
| Who | Jungle creature (and Jojo understudy) |
Isaac Forristall |
| Who | Jungle creature (and Gertrude understudy) |
Eryn Lenhart ** |
| Who | Jungle creature | Jaylynn Agnew ** |
| Who | Jungle creature | Emery Blackford ** |
| Who | Jungle creature | William Brown |
| Who | Jungle creature | Drew Dawson ** |
| Who | Jungle creature | Benjamin Essink |
| Who | Jungle creature | Elayne Forristall |
| Who | Jungle creature | Lucy Laird |
** = denotes CAP mainstage debut