Suggestions by @legoking516

Jamie Lynn Spears

as Gummy Bear in IF (2034)

Chyler Leigh

as Ally in IF (2034)

B. J. Novak

as Guardian Dog in IF (2034)

Theo James

as Ghost in IF (2034)

Corey Feldman

as Cosmo in IF (2034)

Matt Smith

as Magician Mouse in IF (2034)

Sydney Sweeney

as Octopuss in IF (2034)

Nicholas Hoult

as Marshmallow in IF (2034)

Damon Wayans Jr.

as Slime in IF (2034)

Ray Romano

as Art Teacher in IF (2034)

Colin Jost

as Banana in IF (2034)

Elijah Wood

as Flower in IF (2034)

Drake Bell

as Ice in IF (2034)

Mark Wahlberg

as Spaceman in IF (2034)

Maia Mitchell

as Unicorn in IF (2034)

Madelyn Cline

as Bubble in IF (2034)

Danny Glover

as Lewis in IF (2034)

Laura Marano

as Blossom in IF (2034)

Josh Duhamel

as Blue in IF (2034)

Jessica Lange

as The Woman Upstairs in IF (2034)