Suggestions by @damarioncoleman

RJ Cyler

as Julio Mendez in The Flash

John Mulaney

as Officer Bellows in The Flash

Nick Kroll

as Officer Murphy in The Flash

David Sobolov

as Gorilla Godd in The Flash

Ed Asner

as Reggie in The Flash

Ron Livingston

as Henry Allen in The Flash

Maribel Verdú

as Nora Allen in The Flash

Ashleigh Murray

as Iris West in The Flash

Kyle Allen

as Barry Allen in The Flash

Doug Jones

as Saint Walker in Green Lantern Corps

Gwendoline Yeo

as Soranik Natu in Green Lantern Corps

Grey DeLisle

as Aya in Green Lantern Corps

Squirrel

as Ch'p in Green Lantern Corps

Kevin Grevioux

as Kilowog in Green Lantern Corps

Luke Evans

as Sinestro in Green Lantern Corps

Michael Jai White

as John Stewart in Green Lantern Corps

Tom Kenny

as Salaak in Green Lantern Corps

Jeff Bennett

as Tomar-Re in Green Lantern Corps

Darren Norris

as Guardians of the Universe in Green Lantern Corps

Susanne Blakeslee

as Guardians of the Universe in Green Lantern Corps