- Dr. Alec Considine as Dexter
- Dr. John Paul Otis as Dexter's Monkey
- Lisa Cardigan as Dexter's Mom
- Dr. Lew Worship as Dexter's Dad
- Gloria as Dee Dee
- Dr. Sid Lackland as Tall Dexter
- Dr. Sidney Wohl as Douglas
- Dr. Dominic Riccio as Krunk
- Dr. Madolyn Bruckner as Lalava
- Mildred as Mee Mee
- Nurse Didi Loomis as Lee Lee
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