Suggestions by @paulmantell

Anjelica Huston

as Nila Rahmad in Goosebumps: The Movie (1998)

Adam West

as The Galloping Gazelle in Goosebumps: The Movie (1998)

R.L. Stine

as R.L. Stine in Goosebumps: The Movie (1998)

Joe Dante

as Director in Goosebumps: The Movie (1998)

Scott Rudin

as Producer in Goosebumps: The Movie (1998)

Stan Winston

as Special Effects by in Goosebumps: The Movie (1998)

Peter Mayhew

as The Scarecrow in Goosebumps: The Movie (1998)

Ted White

as The Masked Mutant in Goosebumps: The Movie (1998)

Ted White

as The Pumpkin Head in Goosebumps: The Movie (1998)

C.J. Graham

as The Creep in Goosebumps: The Movie (1998)

Randall "Tex" Cobb

as The Werewolf of Fever Swamp in Goosebumps: The Movie (1998)

Michael Winslow

as The Invisible Boy in Goosebumps: The Movie (1998)

Jonathan Hyde

as Alex's Dad in Goosebumps: The Movie (1998)

Frank Welker

as The Abominable Snowman in Goosebumps: The Movie (1998)

James Horner

as Composer in Goosebumps: The Movie (1998)

David Martel

as Logan in Goosebumps: The Movie (1998)

Cybill Shepard

as Alex's Mom in Goosebumps: The Movie (1998)

Dallas McKennon

as The Lawn Gnome(s) in Goosebumps: The Movie (1998)

Paul Winfield

as Principal Dawson in Goosebumps: The Movie (1998)

Allison Fanelli

as Angie in Goosebumps: The Movie (1998)