Suggestions by @milesyeargain

Ioan Gruffudd

as Mr. Fantastic in Fantastic Four: Cosmic World (2007)

Ernie Hudson

as Joe West in The Flash: Scarlet Speedster (2005)

Kerry Washington

as Iris West-Allen in The Flash: Scarlet Speedster (2005)

Tom Hardy

as Captain Boomerang in The Flash: Scarlet Speedster (2005)

Sam Rockwell

as Mirror Master in The Flash: Scarlet Speedster (2005)

Tobey Maguire (The Flash)

as The Flash in The Flash: Scarlet Speedster (2005)

Keanu Reeves (Batman)

as Batman in Cyborg (2005)

Denzel Washington

as Silas Stone in Cyborg (2005)

Jackie Earle Haley

as Gizmo in Cyborg (2005)

Michael B. Jordan

as Cyborg in Cyborg (2005)

Josh Harnett/Superman

as Superman in Martian Manhunter: The Jade Warrior (2004)

Mark Harmon

as Inspector Bill Henderson in Martian Manhunter: The Jade Warrior (2004)

Megalyn Echikunwoke

as Miss Martian in Martian Manhunter: The Jade Warrior (2004)

Wesley Snipes

as Ma’alefa’ak in Martian Manhunter: The Jade Warrior (2004)

Lance Reddick/Martian Manhunter

as Martian Manhunter in Martian Manhunter: The Jade Warrior (2004)

FAKE

as Iron Man in Captain Marvel: Warbird (2007)

Sandra Bullock

as Maria Hill in Captain Marvel: Warbird (2007)

George Clooney (Nick Fury)

as Colonel Nick Fury in Captain Marvel: Warbird (2007)

Clarence Gilyard Jr.

as War Machine in Captain Marvel: Warbird (2007)

Gilbert Gottfried

as M.O.D.O.K. in Captain Marvel: Warbird (2007)