Jeff Wamester Director Jensen Ackles Batman Voice Darren Criss Superman , Earth-2 Superman Voice Corey Stoll Lex Luthor Voice Meg Donnelly Supergirl , Harbinger Voice Aldis Hodge Green Lantern John Stewart Voice Stana Katic Wonder Woman , Superwoman Voice Mark Hamill Earth-12 The Joker Voice Jimmi Simpson Green Arrow Voice Katee Sackhoff Poison Ivy Voice Matt Bomer The Flash , Barry Allen Voice Alexandra Daddario Lois Lane Voice Lou Diamond Phillips The Spectre Voice Gideon Adlon Batgirl Voice Brian Bloom Adam Strange , Sidewinter Voice Dean Winters Captain Storm Voice John DiMaggio Lobo Voice Liam McIntyre Aquaman Voice James Krieg Writer, Producer Kimberly S. Moreau Producer Butch Lukic Executive Producer Sam Register Executive Producer Michael E. Uslan Executive Producer