Suggestions by @austindickey

Michelle Fairley

as Prof. Fiona Pembrooke in Scooby Doo and the Lochness Monster

Score: +1

Robert Carlyle

as Sir Ian Locksley in Scooby Doo and the Lochness Monster

Score: +1

Robbie Coltrane

as Lachlan Haggart in Scooby Doo and the Lochness Monster

Score: +1

Ewan McGregor

as Colin Haggart in Scooby Doo and the Lochness Monster

Score: +1

Kevin McKidd

as Angus Haggart in Scooby Doo and the Lochness Monster

Score: +1

Kelly Macdonald

as Shannon Blake in Scooby Doo and the Lochness Monster

Score: +1

Neil Fanning

as Scooby Doo in Scooby Doo and the Lochness Monster

Score: +1

Matthew Lillard

as Shaggy Rogers in Scooby Doo and the Lochness Monster

Score: +1

Linda Cardellini

as Velma Dinkley in Scooby Doo and the Lochness Monster

Score: +1

Sarah Michelle Gellar

as Daphne Blake in Scooby Doo and the Lochness Monster

Score: +1

Freddie Prinze Jr.

as Fred Jones in Scooby Doo and the Lochness Monster

Score: +1

Jason Bateman

as Dionysus/Mr. D in Percy Jackson and the Olympians

Score: +1

William H. Macy

as Fred in Percy Jackson and the Olympians

Score: +1

Alexis Denisof

as Dr. Thorn in Percy Jackson and the Olympians

Score: +1

Nathan Fillion

as Hermes in Percy Jackson and the Olympians

Score: +1

John Krasinski

as Chiron in Percy Jackson and the Olympians

Score: +1

Luis Armand Garcia

as Jorge Otero in Scooby Doo and the Monster of Mexico

Score: +1

Edward James Olmos

as Senor Fuentes in Scooby Doo and the Monster of Mexico

Score: +1

Belita Moreno

as Dona Dolores Otero in Scooby Doo and the Monster of Mexico

Score: +1

Mike Myers

as Mr. Smiley in Scooby Doo and the Monster of Mexico

Score: +1