Special Guest Stars Tyler Hoechlin as Clark Kent / Superman Melissa Benoist as Kara Danvers / Supergirl Brandon Routh as Ray Palmer / The Atom Brandon Routh as Clark Kent / Superman of Earth-96 Stephen Amell as Oliver Queen / Green Arrow Katherine McNamara as Mia Smoak Tom Welling as Clark Kent of Earth-167 Grant Gustin as Barry Allen / The Flash Matt Ryan as John Constantine Elizabeth Tulloch as Lois Lane Elizabeth Tulloch as Lois Lane (Earth-75) Candice Patton as Iris West-Allen Dominic Purcell as Mick Rory / Heat Wave of Earth-74 Caity Lotz as Sara Lance / White Canary Jon Cryer as Lex Luthor Guest Stars Erica Durance as Lois Lane of Earth-167 Wentworth Miller voices Leonard A.I. Audrey Marie Anderson as Lyla Michaels / Harbinger Kevin Conroy as Bruce Wayne / Batman of Earth-99 Johnathon Schaech as Jonah Hex of Earth-18 Co Starring Elias Hogewoning as Baby Jonathan Kent Benjamin Hogewoning as Baby Jonathan Kent
