Tim Curry

Wadsworth

Eileen Brennan

Mrs. Peacock

Madeline Kahn

Mrs. White

Christopher Lloyd

Professor Plum

Michael McKean

Mr. Green

Martin Mull

Colonel Mustard

Lesley Ann Warren

Miss Scarlet

Colleen Camp

Yvette

Lee Ving

Mr. Boddy

Bill Henderson

Cop

Jane Wiedlin

Singing Telegram Girl

Jeffrey Kramer

Motorist

Kellye Nakahara

Cook

Will Nye

Cop #1

Rick Goldman

Cop #2

Don Camp

Cop #3

Howard Hesseman

The Chief (uncredited)