Jensen Ackles Batman / Bruce Wayne (voice) Darren Criss Superman / Earth-2 Superman (voice) Corey Stoll Lex Luthor (voice) Gideon Adlon Batgirl (voice) Ike Amadi Martian Manhunter / J'onn J'onzz (voice) Geoffrey Arend Psycho Pirate / Charles Halstead (voice) Troy Baker The Joker / Spider Guild Lantern (voice) Brian Bloom Adam Strange / Sidewinter (voice) Matt Bomer The Flash (voice) Ashly Burch Nightshade / Queen Mera (voice) Zach Callison Earth-2 Robin / Robin / Damian Wayne (voice) Kevin Conroy Earth-12 Batman (voice) Alexandra Daddario Lois Lane (voice) Brett Dalton Bat Lash / Captain Atom (voice) John DiMaggio Lobo (voice) Meg Donnelly Supergirl / Kara (voice) Ato Essandoh Mister Terrific (voice) Keith Ferguson Doctor Fate / Two-Face (voice) Will Friedle Batman Beyond / Kamandi (voice) Jennifer Hale Hippolyta / Green Lantern Aya (voice) Mark Hamill Earth-12 The Joker (voice) Aldis Hodge Green Lantern John Stewart (voice) Jamie Gray Hyder Hawkgirl / Young Diana (voice) Erika Ishii Doctor Light / Dr. Hoshi / Huntress (voice) Stana Katic Wonder Woman (voice) David Kaye The Question / Cardonian Lantern (voice) Matt Lanter Blue Beetle (voice) Liam McIntyre Aquaman (voice) Cynthia Kaye McWilliams Dr. Beth Chapel / The Cheetah (voice) Lou Diamond Phillips The Spectre (voice) Elysia Rotaru Black Canary / Black Canary II (voice) Matt Ryan Constantine (voice) Katee Sackhoff Poison Ivy (voice) Keesha Sharp Vixen (voice) Jimmi Simpson Green Arrow (voice) Jason Spisak Blue Lantern Razer / Hayseed (voice) Armen Taylor The Flash / Jay Garrick / Gas Soldier / Executioner (voice) Dean Winters Captain Storm (voice)