Feral, and fiercely driven by the memory of her mother, Hester joins forces with Tom Natsworthy (Robert Sheehan), an outcast from London, along with Anna Fang (Jihae), a dangerous outlaw with a bounty on her head.
Visual effects are created by a Weta Digital team led by Ken McGaugh, Kevin Smith, Luke Millar, and Dennis Yoo. The Universal and MRC adaptation is from the award-winning book series by Philip Reeve, published in 2001 by Scholastic.
On board as producers are Zane Weiner (The Hobbit trilogy), Amanda Walker (The Hobbit trilogy) and Deborah Forte (Goosebumps), as well as Walsh and Jackson. Ken Kamins (The Hobbit trilogy) joins Boyens as executive producer. Universal distributed the film worldwide.