Jack Quaid
as Alberto (voice)
David Dastmalchian
as Calendar Man (voice)
Titus Welliver
as Carmine Falcone (voice)
Troy Baker
as Joker (voice)
Amy Landecker
as Barbara Gordon (voice)
Naya Rivera
as Catwoman / Selina Kyle (voice)
Fred Tatasciore
as Solomon Grundy (voice)