Suggestions by @benjombunud

James Arnold Taylor

as The Flash (Young Justice) in DC Multiverse

Seth Green

as Batman (Robot Chicken) in DC Multiverse

Alfred Molina

as Lex Luthor (Robot Chicken) in DC Multiverse

Ryan Reynolds

as Hal Jordan (2011 Film) in DC Multiverse

Adrian Pasdar

as Tony Stark (Earth-12041) in Avengers: Multiverse

David Harewood

as Martian Manhunter (Arrowverse) in DC Multiverse

Carl Lumbly

as Martian Manhunter (DCAU) in DC Multiverse

Josh Brolin

as Thanos (Earth-199999) in Avengers: Multiverse

Zach Callison

as Robin in An Original DC Animated Fan Cast

Max Mittelman

as Red Robin in An Original DC Animated Fan Cast

Christopher Reeve

as Superman (Donnerverse) in DC Multiverse

Asher Angel

as Billy Batson (DCEU) in DC Multiverse

Gilbert Gottfried

as Mxyzptlk (Justice League Action) in DC Multiverse

Peter Gadiot

as Mxyzptlk (Arrowverse) in DC Multiverse

Gilbert Gottfried

as Mxyzptlk (DCAU) in DC Multiverse

Paul Reubens

as Bat-Mite (Brave And The Bold) in DC Multiverse

Jason Momoa

as Aquaman (DCEU) in DC Multiverse

James Woods

as Owlman (Crisis On Two Earths) in DC Multiverse

Bruce Greenwood

as Batman (Young Justice) in DC Multiverse

Mark Rolston

as Lex Luthor (Young Justice) in DC Multiverse