Suggestions by @chefner

Elijah Wood

as Benjy Fleming in Mr Monk (1992-1999)

Score: +1

Jamie Farr

as Ambrose Monk in Mr Monk (1992-1999)

Score: +1

Liz Sheridan

as Cheryl Fleming in Mr Monk (1992-1999)

Score: +1

Jason Robards

as Ethan Rickover in Mr Monk (1992-1999)

Score: +1

Harry Dean Stanton

as Jack Monk Sr. in Mr Monk (1992-1999)

Score: +1

Debra Engle

as Sharona Fleming in Mr Monk (1992-1999)

Score: +1

Charlie Schlatter

as Kevin Dorfman in Mr Monk (1992-1999)

Score: +1

P.H. Moriarty

as Leland Stottlemeyer in Mr Monk (1992-1999)

Score: +1

Casey Kasem

as Adrian Monk in Mr Monk (1992-1999)

Score: +2

Jonas Dassler

as Adolf Hitler in Hitler: The Nazi Circle

Score: -1

Ian McNeice

as Vernon Dursley in Alternate Harry Potter Cast (2001-2011)

Score: +2

Tom Bosley

as Commissioner Gordon in Tim Burton’s Batman (1999)

Score: +1

Carl Weathers

as Harvey Dent in Tim Burton’s Batman (1999)

Score: +1

Robin Williams

as The Joker in Tim Burton’s Batman (1999)

Score: +1

Leslie Phillips

as Alfred Pennyworth in Tim Burton’s Batman (1999)

Score: +1

Kevin Costner

as Batman in Tim Burton’s Batman (1999)

Score: +1

Miles Teller

as Paul Artreides in Dune [2011-2014]

Score: +2

Helen McCrory

as Lady Jessica in Dune (2011)

Score: 0

Miles Teller

as Paul Atreides in Dune (2011)

Score: +4