Suggestions by @jys6612

Marlon Brando

as Jor-El in Man of Steel (2003)

Score: -1

George Lazenby

as Allan Quatermain in The league of extraordinary gentlemen

Score: -3

Timothy Dalton

as Allan Quatermain in The league of extraordinary gentlemen

Score: +7

Vangelis

as Composer in Fett: A Star Wars Story

Score: +1

David Prowse

as Darth Vader in Fett: A Star Wars Story

Score: +2

Ralph Richardson

as Alfred Pennyworth in The Perfect Batman Movie

Score: -13

Adolf Hitler

as Adolf Hitler in Hitler: The Man, The Myth, The Legend

Score: +1

Joe Dante

as Director in House of the Long Shadows

Score: +1

Jared Harris

as Sam Allyson in House of the Long Shadows

Score: +1

Kaya Scodelario

as Mary Norton in House of the Long Shadows

Score: +1

Jenny Agutter

as Victoria Grisbane in House of the Long Shadows

Score: +1

Miles Teller

as Kenneth Magee in House of the Long Shadows

Score: +1

Bill Nighy

as Roderick Grisbane in House of the Long Shadows

Score: +1

Ian McDiarmid

as Sebastian Grisbane in House of the Long Shadows

Score: +1

Robert Englund

as Lionel Grisbane in House of the Long Shadows

Score: +2

Max von Sydow

as Lord Elijah Grisbane in House of the Long Shadows

Score: +1

Forest Whitaker

as The Doctor in Doctor who (series 14)

Score: -6

Pierce Brosnan

as Aslan in The Chronicles of Narnia (Remake)

Score: -3