Mortal Engines is set in a post-apocalyptic world where cities roam the landscape, devouring everything in their path. Tom (Robert Sheehan, from TV's Misfits) lives in London, a 'predator' city built on digger-like tracks. After encountering a mysterious fugitive with murder in mind, he finds himself touching bare earth for the first time. Showcasing the eye-opening imagery of Weta Digital, Mortal Engines is based on a book by Brit Philip Reeve. It marks the first feature directed by Christian Rivers (short film Feeder). The Weta veteran began as a storyboard artist for Peter Jackson.