Suggestions by @darthspidermaul

Bryan Cranston

as Commissioner Gordon in Batman

Josh Henderson

as Talon in Nightwing

Jeremy Irons

as Alfred Pennyworth in Nightwing

Ben Affleck

as Batman (Flashbacks) in Nightwing

Joe Keery

as Nightwing in Nightwing

Aidan Gallagher

as Robin in Nightwing

Jason Momoa

as Aquaman in Justice League: Knightmare

Henry Cavill

as Superman in Justice League: Knightmare

Ray Porter

as Darkseid in Justice League: Knightmare

Gina Carano

as Big Barda in Justice League: Knightmare

Dacre Montgomery

as Arsenal in Justice League: Knightmare

Joe Keery

as Nightwing in Justice League: Knightmare

Jared Leto

as Joker in Justice League: Knightmare

Joe Manganiello

as Deathstroke in Justice League: Knightmare

Emilia Clarke

as Mera in Justice League: Knightmare

Ray Fisher

as Cyborg in Justice League: Knightmare

Luke Evans

as Sinestro in Zack Snyder's Justice League: The Legion of Doom

Dwayne Johnson

as Black Adam in Zack Snyder's Justice League: The Legion of Doom

Zachary Levi

as Shazam in Zack Snyder's Justice League: The Legion of Doom

Harry Lennix

as Martian Manhunter in Zack Snyder's Justice League: The Legion of Doom