ONCE UPON A SNOWMAN: Filmmakers Discuss New FROZEN Short on Disney+ The new Walt Disney Animation Studios’ short ONCE UPON A SNOWMAN explores what happened to Olaf between the moment he was created by Elsa and before he met Anna and Kristoff. During a recent, virtual press conference, the filmmakers talked in detailed about the animated adventure, including Trent Correy (Director / Writer), Dan Abraham (Director / Writer), Peter Del Vecho (Creative Consultant), Becky Bresee (Head of Animation). Watch the conversation below and catch ONCE UPON A SNOWMAN this Friday, when it debuts exclusively on Disney+. The film follows Olaf’s first steps as he comes to life and searches for his identity in the snowy mountains outside Arendelle.