Matt Bomer The Flash / Barry Allen (voice) Jensen Ackles Batman / Bruce Wayne (voice) Darren Criss Clark Kent / Superman / Earth-2 Superman (voice) Meg Donnelly Supergirl / Harbinger (voice) Stana Katic Wonder Woman / Superwoman (voice) Jimmi Simpson Green Arrow (voice) Zachary Quinto Lex Luthor (voice) Jonathan Adams The Monitor / The Anti-Monitor (voice) Ike Amadi J’onn J’onzz / Martian Manhunter / Amazing Man / Ivo (voice) Geoffrey Arend Psycho Pirate / Hawkman (voice) Zach Callison Dick Grayson / Robin (voice) Alexandra Daddario Lois Lane (voice) Alastair Duncan Alfred (voice) Ato Essandoh Mr. Terrific (voice) Cynthia Hamidi Dawnstar (voice) Aldis Hodge John Stewart / Green Lantern / Power Ring (voice) Erika Ishii Doctor Light / Dr. Hoshi / Huntress (voice) David Kaye The Question (voice) Ashleigh LaThrop Iris West (voice) Matt Lanter Blue Beetle / Ultraman (voice) Liam McIntyre Aquaman / Johnny Quick (voice) Nolan North Hal Jordan / Amazo / Homeless Man (voice) Lou Diamond Phillips The Spectre / Owlman (voice) Keesha Sharp Vixen (voice) Harry Shum Jr. Brainiac 5 (voice)