Batman/Dexter's Laboratory

Heroes
Bruce Wayne/Batman as Dexter

Alfred Pennyworth as Dexter's Dad

Commisioner James Gordon as Major Glory

Detective Harvey Bullock as Tall Dexter

Dick Grayson/Robin as Dexter's Monkey

Officer Renee Montoya as Mee Mee

Villains
The Joker as Mandark

Selina Kyle/Catwoman as Lee Lee

Dr. Pamela Lillian Isley/Poison Ivy as Dee Dee

Dr. Johnathan Crane/the Scarecrow as Surfer Boy

Mary Dahl/Baby Doll as Lalavava