Suggestions by @optimistic_writer

Kevin Costner

as Aquaman in Justice League (1993)

Score: +1

John Wesley Shipp

as The Flash in Justice League (1993)

Score: +1

Lynda Carter

as Wonder Woman in Justice League (1993)

Score: +1

Michael Keaton

as Batman in Justice League (1993)

Score: +1

Christopher Reeve

as Superman in Justice League (1993)

Score: +1

Faye Dunaway

as Evil Lyn in Masters of the Universe (1974)

Score: +1

Tom Selleck

as Man-At-Arms in Masters of the Universe (1974)

Score: +1

Frank Langella

as Skeletor in Masters of the Universe (1974)

Score: +1

Jane Fonda

as Teela in Masters of the Universe (1974)

Score: +1

Sam J. Jones

as He-Man in Masters of the Universe (1974)

Score: +1

Toby Jones

as Gollum in The Lord of the Rings (2012-2014)

Score: +1

Matthew Lewis

as Pippin in The Lord of the Rings (2012-2014)

Score: +1

James Phelps

as Merry in The Lord of the Rings (2012-2014)

Score: +1

Alan Rickman

as Saruman in The Lord of the Rings (2012-2014)

Score: +1

Robbie Coltrane

as Gimli in The Lord of the Rings (2012-2014)

Score: +1

Tom Felton

as Legolas in The Lord of the Rings (2012-2014)

Score: +1