Suggestions by @hawkmaestro

Robert Downey Jr.

as Iron Man in Crisis On Infinite Earths

Henry Cavill

as Superman (Cavill) in Crisis On Infinite Earths

JimJam

as Jim Jam in Goo

Sylvester Stallone

as Frederick Foswell in Fancasting Spider-Man villains in MCU

Norman Reedus

as Ghost Rider in Heroes For Hire

Tom Welling

as Superman (Welling) in Crisis On Infinite Earths

Brandon Routh

as Superman (Routh) in Crisis On Infinite Earths

Christopher Reeve

as Superman (Reeves) in Crisis On Infinite Earths

David Mazouz

as Batman (Mazouz) in Crisis On Infinite Earths

Michael Keaton

as Batman (Keaton) in Crisis On Infinite Earths

Ben Affleck

as Batman (Affleck) in Crisis On Infinite Earths

CGI Adam West

as Batman (Cameo) (West) in Crisis On Infinite Earths

Robert Pattinson

as Batman (Pattinson) in Crisis On Infinite Earths

Christian Bale

as Batman (Bale) in Crisis On Infinite Earths

David Ramsey

as Spartan in Crisis On Infinite Earths

Melissa Benoist

as Supergirl in Crisis On Infinite Earths

Stephen Amell

as Green Arrow in Crisis On Infinite Earths

Grant Gustin

as The Flash in Crisis On Infinite Earths

Hailee Steinfeld

as Female Singer in Who is your favourite?

Lady Gaga

as Harleen Quinzel in Joker : Folie a Deux