Suggestions by @timemachine

Keanu Reeves

as Josh Detmer in Freaky (1990)

Danny Elfman

as Composer in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Tim Burton

as Producer in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Tim Burton

as Director in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Geena Davis

as Mrs. Butterbean in The Grim Adventures of Billy & Mandy ('90s live-action movie)

David Krumholtz

as Nergal Jr. in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Annie Potts

as Aunt Sis in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Michael Keaton

as Nergal in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Alec Baldwin

as Phillip in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Kurt Russell

as Hoss Delgado in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Sarah Jessica Parker

as Eris in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Michelle Pfeiffer

as Claire in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Catherine O'Hara

as Gladys in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Chris Farley

as Harold in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Joseph Gordon-Levitt

as Piff in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Patrick Renna

as Sperg in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Christine Lakin

as Mindy in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Haley Joel Osment

as Pud'n in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Jaleel White

as Irwin in The Grim Adventures of Billy & Mandy ('90s live-action movie)

Ariana Richards

as Mandy in The Grim Adventures of Billy & Mandy ('90s live-action movie)