Short, Sweet Adaptation
While this does have a slightly scary interaction with a dragon that may make it inappropriate for some children under 4, my 2-year-old is obsessed with this movie and the other two BBC-produced adaptations of the same author's work (The Gruffalo & The Gruffalo's Child).
She will ask anyone who will listen, "Have you seen Woom on Boom? Is SOOO cute TB show!"
It's pacing is very much like having a book read to you, not frenetic like some children's fare.
It teaches kindness, acceptance, cooperation, and - if your child can handle the scary parts - triumphing over the things that frighten you.