- Robin Sena as Sarah Hall-Small
- Amon as The Cat in the Hat
- Haruto Sakaki as Sir Topham Hatt
- Michael Lee as Sam-I-Am
- Miho Karasuma as Pam-I-Am
- Yurika Dojima as Joan
- Takuma Zaizen as The Grinch
- Shintaro Kosaka as Norval the Fish
- Master as Mr. Brown
- Shohei Hattori as Morton the Elephant Bird
- Toko Masaki as Little Cat B
- Shunji Nagira as Thidwick the Big-Hearted Moose
- and more
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