Suggestions by @lyndellcourts

Alec Baldwin

as Megatron (D-16) in Transformers One (2004 version)

Johnny Depp

as Optimus Prime (Orion Pax) in Transformers One (2004 version)

Michelle Trachtenberg

as Bea in IF (1999 Version)

Doris Roberts

as Bea's Grandmother in IF (1999 Version)

John Travolta

as Bea's Dad in IF (1999 Version)

Tom Cruise

as Cal in IF (1999 Version)

Sean Astin

as Banana in IF (1999 Version)

John Travolta

as Marshmallow in IF (1999 Version)

Damon Wayans

as Robot in IF (1999 Version)

Willem Dafoe

as Ghost in IF (1999 Version)

Bernie Mac

as Slime in IF (1999 Version)

Jennifer Aniston

as Gummy Bear in IF (1999 Version)

Ben Affleck

as Ice in IF (1999 Version)

Mark Wahlberg

as Guardian Dog in IF (1999 Version)

Kelly Preston

as Octopuss in IF (1999 Version)

Martin Sheen

as Cosmo in IF (1999 Version)

John Leguizamo

as Magician Mouse in IF (1999 Version)

Kevin Bacon

as Art Teacher in IF (1999 Version)

Christina Applegate

as Alligator in IF (1999 Version)

David Arquette

as Flower in IF (1999 Version)