Suggestions by @gordillio

George MacKay

as Hank McCoy in X-Men: First Class

Harris Dickinson

as Warren Worthington III in X-Men: First Class

Xolo Maridueña

as Bobby Drake in X-Men: First Class

Jodie Comer

as Jean Grey in X-Men: First Class

Jack Lowden

as Scott Summers in X-Men: First Class

Kenneth Branagh

as Erik Lehnsherr in X-Men: First Class

Lennie James

as Charles Xavier in X-Men: First Class

Lennie James

as "The Professor" in The Avengers

Spoiler

as "The Professor" in The Avengers

Javier Bardem

as "The Titan" in The Avengers

Spoiler

as "The Titan" in The Avengers

Sterling K. Brown

as James Rhodes in The Avengers

Holland Roden

as Pepper Potts in The Avengers

Mary Elizabeth Winstead

as Janet Van Dyne in The Avengers

Antony Starr

as Hank Pym in The Avengers

Lauren Cohan

as Maria Hill in The Avengers

Martin Freeman

as Phil Coulson in The Avengers

Giancarlo Esposito

as Nick Fury in The Avengers

Nicholas Hoult

as Loki in The Avengers

Paul Dano

as Bruce Banner in The Avengers