Suggestions by @g_comicbookguy

Rory Calhoun

as Hercules in MCU-1960's

Don Rickles

as Rocket Raccoon in MCU-1960's

Natalie Schafer

as Nova Prime in MCU-1960's

Helmut Dantine

as Helmut Zemo in MCU-1960's

Jonathan Harris

as Red Skull in MCU-1960's

Nichelle Nichols

as Gamora in MCU-1960's

Alan Napier

as Thaddeus Ross in MCU-1960's

Tony Todd

as Algrim the Strong in MCU 90's (Reboot)

Thomas F. Wilson

as Venom in MCU 90's (Reboot)

Alan Hale Jr.

as Happy Hogan in Marvel Cinematic Universe (1960's)

Joseph Wiseman

as Vulture in Marvel Cinematic Universe (1960's)

Telly Savalas

as Iron Monger in Marvel Cinematic Universe (1960's)

Russell Johnson

as Erik Selvig in Marvel Cinematic Universe (1960's)

Peter Ustinov

as Odin in Marvel Cinematic Universe (1960's)

Harold Sakata

as Wong in Marvel Cinematic Universe (1960's)

Dawn Wells

as Scarlet Witch in Marvel Cinematic Universe (1960's)

Harold Sakata

as Wong in The Marvel Cinematic Universe Starting 1968-1979

Peter Ustinov

as Odin in Avengers 60s

Ray Barrett

as Ultron in Avengers 60s

Harold Sakata

as Wong in Avengers 60s