Suggestions by @tylorwilliams1
998 suggestions

Dee Bradley Baker
as General Zod in Superman: A New Hope

Nolan North
as Clark Kent/Superman in Superman: A New Hope
C. Thomas Howell
as Harrison Wells in The Flash: The Fastest Man Alive

Dwight Schultz
as Evan McCulloch/Mirror Master in The Flash: The Fastest Man Alive

Eric Bauza
as Joe West in The Flash: The Fastest Man Alive

Tara Platt
as Iris West in The Flash: The Fastest Man Alive

Yuri Lowenthal
as Barry Allen/The Flash in The Flash: The Fastest Man Alive

William Saylers
as Harrison Wells in The Flash: The Fastest Man Alive

Benedict Cumberbatch
as Sinestro (Former green lantern) in Lanterns

Kevin Michael Richardson
as Kilawog in Lanterns
Steve Carell
as Chip in Lanterns

Dana Gaier
as Arisia in Lanterns

Jason Biggs
as Guy Gardner (Green Lantern) in Lanterns

Amy Palant
as Carol Ferris in Lanterns

Dan White
as John Stewart (Green Lantern) in Lanterns

Steve Blum
as Hal Jordon (Green Lantern) in Lanterns

David Kaye
as Saint Walker in Lanterns
Peter Cullen
as Ganthet in Lanterns

Clancy Brown
as Zeus in Wonder Woman: Warrior of Peace

Ike Amadi
as Ares in Wonder Woman: Warrior of Peace