Suggestions by @superbat

Denzel Washington

as John Stewart in Green Lantern (1990)

Will Smith

as James Rhodes in Marvel Knights Cinematic Universe (MCU 2000s)

Will Smith

as James Rhodes in Marvel Knights Cinematic Universe (MCU 2000s)

Keanu Reeves

as Marc Spector in Marvel Knights Cinematic Universe (MCU 2000s)

Neil Patrick Harris

as Ned Leeds in Marvel Knights Cinematic Universe (MCU 2000s)

Brian Cox

as William Stryker in Avengers: Age of Ultron (2015)

Josh Brolin

as Thanos in Avengers: Age of Ultron (2015)

Andy Serkis

as Ulysses Klaue in Avengers: Age of Ultron (2015)

Ty Simpkins

as Harley Keener in Iron Man 3 (2013)

Julian McMahon

as Victor Von Doom/Doctor Doom in Avengers: Age of Ultron (2015)

Hayley Atwell

as Agent Carter in Avengers: Age of Ultron (2015)

Patrick Stewart

as Charles Xavier in Avengers: Age of Ultron (2015)

Ian McKellen

as Erik Lensherr in Avengers: Age of Ultron (2015)

Famke Janssen

as Jean Grey in Avengers: Age of Ultron (2015)

Idris Elba

as Heimdall in Avengers: Age of Ultron (2015)

Michael Chiklis

as Ben Grimm in Avengers: Age of Ultron (2015)

Chris Pine

as Johnny Storm in Avengers: Age of Ultron (2015)

Jessica Alba

as Susan Storm in Avengers: Age of Ultron (2015)

Ioan Gruffudd

as Reed Richards in Avengers: Age of Ultron (2015)

Wesley Snipes

as Eric Brocks in Avengers: Age of Ultron (2015)