The Cat In The Hat as Igor
Norval the Fish as Dr. Holzuwurm
Joey as King Malbert
Sarah Hall-Small as Eva
Mack the Turtle as Brain
Sam-I-Am as Scramper
Mr. Brown as Dr. Glickenstein
The White Tufted Bird as Blind Woman/Killseum Fan 1
Vlad Vladikoff as Blind Orphan 1
Flying Dutchman (from Spongebob Squarepants) as Dr. Schadenfreude
The Lorax as Dr. Holzuwurm's Igor
Sylvester McMonkey McBean as Announcer/Royal Guard 2
Jane Kangaroo as Jaclyn/Heidi
Horton the Elephant as Dr. Herzschlag
Little Cat Fleep as Sonic (Cameo)
Morton the Elephant Bird as Tails (cameo)