Suggestions by @darkstorm

Michael T. Weiss

as Captain Atom/Nathaniel Adams in Justice League Animated Series

Lacey Chabert

as Zatanna in Justice League Animated Series

Jason Spisak

as Flash/Wally West in Justice League Animated Series

Jesse McCartney

as Nightwing/Dick Grayson in Justice League Animated Series

Jason Marsden

as Atom/Ray Palmer in Justice League Animated Series

Jeff Bennett

as Red Tornado/John Smith in Justice League Animated Series

Nicholle Tom

as Supergirl/Kara Kent/Kara Zor-El in Justice League Animated Series

Morena Baccarin

as Black Canary/Dinah Laurel Lance in Justice League Animated Series

Kin Shriner

as Green Arrow/Oliver Queen in Justice League Animated Series

Matt Lanter

as Aquaman/Arthur Curry in Justice League Animated Series

Nathan Fillion

as Green Lantern/Hal Jordan in Justice League Animated Series

Christopher Gorham

as Flash/Barry Allen in Justice League Animated Series

Jason Marsden

as Flash / Bart Allen in Justice League Animated Series

Sharon Lawrence

as Maxima in Justice League Animated Series

Khary Payton

as Aquaman / Jackson Hyde in Justice League Animated Series

Yvonne Strahovski

as Batwoman / Kate Kane in Justice League Animated Series

Matt Ryan

as John Constantine in Justice League Animated Series

Cree Summer

as Thunder / Anissa Pierce in Justice League Animated Series

Phil LaMarr

as Green Lantern / John Stewart in Justice League Animated Series

Daniela Bobadilla

as Miss Martian / Megan Morse in Justice League Animated Series