Suggestions by @austindickey

Toby Stephens

as Poseidon in Percy Jackson and the Olympians

Score: +1

Daniel Diemer

as Tyson in Percy Jackson and the Olympians

Score: +2

Dolly Parton

as Dottie in Scooby Doo and The Alien Invaders

Score: +1

Steve Martin

as Lester in Scooby Doo and The Alien Invaders

Score: +1

Alana de la Garza

as Laura in Scooby Doo and The Alien Invaders

Score: +1

Mark-Paul Gosselaar

as Steve in Scooby Doo and The Alien Invaders

Score: +1

Jordana Brewster

as Crystal in Scooby Doo and The Alien Invaders

Score: +1

Dulé Hill

as Max in Scooby Doo and The Alien Invaders

Score: +1

Lacey Chabert

as Amber in Scooby Doo and The Alien Invaders

Score: +1

Danny DeVito

as Sergio in Scooby Doo and The Alien Invaders

Score: +1

Adam Beach

as Buck in Scooby Doo and The Alien Invaders

Score: +1

Neil Fanning

as Scooby Doo in Scooby Doo and The Alien Invaders

Score: +1

Matthew Lillard

as Shaggy Rogers in Scooby Doo and The Alien Invaders

Score: +1

Linda Cardellini

as Velma Dinkley in Scooby Doo and The Alien Invaders

Score: +1

Sarah Michelle Gellar

as Daphne Blake in Scooby Doo and The Alien Invaders

Score: +1

Freddie Prinze Jr.

as Fred Jones in Scooby Doo and The Alien Invaders

Score: +1

Cate Blanchett

as Sarah Ravencroft in Scooby Doo and The Witch's Ghost

Score: +1

Neil Flynn

as Mr. McKnight in Scooby Doo and The Witch's Ghost

Score: +1

Tatyana Ali

as Luna in Scooby Doo and The Witch's Ghost

Score: +1

Allison Mack

as Dusk in Scooby Doo and The Witch's Ghost

Score: +1