Suggestions by @goodsaul_man

Zendaya

as Luna in Mystery Inc (TV Series)

Sabrina Carpenter

as Dusk in Mystery Inc (TV Series)

Jenna Ortega

as Thorn in Mystery Inc (TV Series)

Bryan Cranston

as Sheriff Bronson Stone in Mystery Inc (TV Series)

Thomasin McKenzie

as Velma Dinkley in Mystery Inc (TV Series)

The Safdie Brothers

as Director in Mystery Inc (TV Series)

Danny Pudi

as Scrappy Doo in Mystery Inc (TV Series)

Hailee Steinfeld

as Velma Dinkley in Mystery Inc (TV Series)

Sophia Lillis

as Daphne Blake in Mystery Inc (TV Series)

Harris Dickinson

as Fred Jones in Mystery Inc (TV Series)

Dominic Sessa

as Norville Rogers in Mystery Inc (TV Series)

Donald Glover

as Scooby Doo in Mystery Inc (TV Series)

Danny Boyle

as Director in Too Silly: A Monty Python Film

Carey Mulligan

as Carol Cleveland in Too Silly: A Monty Python Film

Asa Butterfield

as Michael Palin in Too Silly: A Monty Python Film

Paul Dano

as Terry Gilliam in Too Silly: A Monty Python Film

Jim Caddick

as Terry Jones in Too Silly: A Monty Python Film

George MacKay

as Eric Idle in Too Silly: A Monty Python Film

Joseph Quinn

as John Cleese in Too Silly: A Monty Python Film

Will Poulter

as Graham Chapman in Too Silly: A Monty Python Film