Suggestions by @masterlawdog

Ben Gazzara

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Ernest Borgnine

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

David Niven

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Dan Aykroyd

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Gene Wilder

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Mel Blanc

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Albert Brooks

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

John Ritter

as K-2SO (Voice) in Star Wars: Rogue One in the 70's

Ben Gazzara

as K-2SO in Star Wars: Rogue One in the 70's

David Prowse

as K-2SO in Star Wars: Rogue One in the 70's

Peter Mayhew

as K-2SO in Star Wars: Rogue One in the 70's

Laurence Fishburne

as Bodhi Rook in Star Wars: Rogue One in the 70's

Richard Pryor

as Bodhi Rook in Star Wars: Rogue One in the 70's

Richard Dreyfuss

as Bodhi Rook in Star Wars: Rogue One in the 70's

Brad Dourif

as Bodhi Rook in Star Wars: Rogue One in the 70's

John Cazale

as Bodhi Rook in Star Wars: Rogue One in the 70's

Jeff Goldblum

as Saw Gerrera in Star Wars: Rogue One in the 70's

Scott Glenn

as Saw Gerrera in Star Wars: Rogue One in the 70's

Louis Gossett Jr.

as Saw Gerrera in Star Wars: Rogue One in the 70's

Klaus Kinski

as Saw Gerrera in Star Wars: Rogue One in the 70's