Jay Oliva Director Matt Ryan John Constantine Voice Jason O'Mara Bruce Wayne , Batman Voice Camilla Luddington Zatanna Voice Nicholas Turturro Boston Brand , Deadman Voice Ray Chase Jason Blood , Etrigan the Demon Voice Jerry O'Connell Clark Kent , Superman Voice Rosario Dawson Diana Prince , Wonder Woman Voice Jeremy Davies Ritchie Simpson Voice Enrico Colantoni Felix Faust Voice Alfred Molina Destiny Voice Roger Cross Dr. Alec Holland , Swamp Thing , John Stewart , Green Lantern Voice Colleen O'Shaughnessey Black Orchid Voice JB Blanc Abnegazar Voice Ernie Altbacker Screenwriter Benjamin Melniker Executive Producer Sam Register Executive Producer Michael E. Uslan Executive Producer Robert J. Kral Original Music Wes Gleason Casting