In this stop-motion kids' flick, gremlins that wear cardboard boxes like turtle shells emerge at night to Dumpster-dive. The script lacks the wit of Wallace & Gromit — even the trolls groan at a giant cheese named the Briehemoth — and never sinks its teeth into the twisted fantasy of its premise. But voicing the putrid villain Archibald Snatcher (who's modeled as either a tribute or an insult to actor Timothy Spall), Ben Kingsley gives the funniest performance of his career. B-