Suggestions by @user_359813

Tara Platt

as Lois Lane in Justice League (Season 1) Episode 3: Pop out

Mark Oliver

as Slade Wilson/Deathstroke in Justice League (Season 1) Episode 3: Pop out

Brent Miller

as Sinestro in Justice League (Season 1) Episode 3: Pop out

Kevin Michael Richardson

as David Hyde/Black Manta in Justice League (Season 1) Episode 3: Pop out

Amy Palant

as Cheetah (Barbara Menovra) in Justice League (Season 1) Episode 3: Pop out

Jeffery Combs

as Scarecrow in Justice League (Season 1) Episode 3: Pop out

Eminem

as Lenord Snart/Captain Cold in Justice League (Season 1) Episode 3: Pop out

Clancy Brown

as Lex Luthor in Justice League (Season 1) Episode 3: Pop out

Clancy Brown

as Lex Luthor in Justice League (Season 1) Episode 2: Back together

Frank Welker

as Unknown entity in Justice League (Season 1) Episode 2: Back together

Yuri Lowenthal

as Clark Kent/Superman (Tooken over by an unknown entity) in Justice League (Season 1) Episode 2: Back together

Dave Fennoy

as J’onn J’onzz/Martian Manhunter in Justice League (Season 1) Episode 2: Back together

Mahershala Ali

as John Stewart/Green Lantern in Justice League (Season 1) Episode 2: Back together

Brian Bloom

as Arthur Curry/Aquaman in Justice League (Season 1) Episode 2: Back together

Macaulay Culkin

as Wally West/The Flash in Justice League (Season 1) Episode 2: Back together

Grey DeLisle

as Diana Prince/Wonder Woman in Justice League (Season 1) Episode 2: Back together

Roger Craig Smith

as Bruce Wayne/Batman in Justice League (Season 1) Episode 2: Back together

Clancy Brown

as Lex Luthor in Justice League (Season 1) Episode 1: Caped Crusader

Dave Fennoy

as J’onn J’onz/Martian Manhunter in Justice League (Season 1) Episode 1: Caped Crusader

Paul Dobson

as Arthur Curry/Aquaman in Justice League (Season 1) Episode 1: Caped Crusader