Olaf Prequel Coming To Disney Plus We will finally get to know the backstory of Frozen snowman Olaf. Disney Plus has created a new series called Once Upon A Snowman. The show will explore the adventures of Olaf after Elsa created him. Don't worry, Josh Gad will remain the voice of the loveable sidekick. Once Upon A Snowman debuts on Disney Plus on October 23rd. Who is your favorite Frozen character?