Suggestions by @adambell

Carmen Electra

as Amelia von Butch in Scooby-Doo! Cinematic Universe

Rami Malek

as Prince Omar in Scooby-Doo! Cinematic Universe

Rose Leslie

as Shannon Blake in Scooby-Doo! Cinematic Universe

Lana Parrilla

as Best TV Actress in Hollywood Superlatives

Sarah Paulson

as Tomina Kasanski in Scooby-Doo! Cinematic Universe

Martha Quinn

as Martha Quinn in Scooby-Doo! Cinematic Universe

Lyndon Smith

as Abigail Gluck in Scooby-Doo! Cinematic Universe

Margot Robbie

as Marianne Blanchard in Scooby-Doo! Cinematic Universe

Derek Klena

as Oswald Burlington in Scooby-Doo! Cinematic Universe

Sia

as Eeko in Scooby-Doo! Cinematic Universe

Laura Bell Bundy

as Marion Spartan in Scooby-Doo! Cinematic Universe

Jenna Dewan

as Amy Cavenaugh in Scooby-Doo! Cinematic Universe

Elizabeth Banks

as Amanda Smythe in Scooby-Doo! Cinematic Universe

Josh Hutcherson

as Augie Anderson in Scooby-Doo! Cinematic Universe

Linda Cardellini

as Principal Quinlan in Scooby-Doo! Cinematic Universe

Courteney Cox

as Sheila Altoonian in Scooby-Doo! Cinematic Universe

John Schneider

as Franklin Fruitmeir in Scooby-Doo! Cinematic Universe

Mister Lobo

as Professor Raffalo in Scooby-Doo! Cinematic Universe

Harlan Ellison

as Harlan Ellison in Scooby-Doo! Cinematic Universe

Elizabeth Gillies

as Vampire Waitress in Scooby-Doo! Cinematic Universe