Dexter, a boy-genius with a secret laboratory, constantly battles his sister Dee Dee, who always gains access despite his best efforts to keep her out, as well as his arch-rival and neighbor, Mandark. Jeff Bennett, Kath Soucie, Christine Cavanaugh, Kat Cressida, Candi Milo, Allison Moore, Eddie Deezen Added on HBO 2022-06-06.