- Elmo as Dexter
- BJ as Tall Dexter
- Zoe as Dee Dee
- Stacy Jones as Mom
- Mr. Ratburn as Dad
- Mr. Condcutor (GC) as Grandpa
- Princess Presto as Lee Lee
- Wonder Red as Mee Mee
- The Mayor as Mr. Luzinsky
- Dr. Two-Brains as Mandark
- Curious George as Dexter's Monkey
- Buster as Mandark's Duck
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