In the animated film 'The Addams Family', Finn Wolfhard provides the voice for Pugsley Addams, the mischievous and eccentric son of Gomez and Morticia Addams. The movie showcases the quirky and macabre adventures of the Addams family as they navigate the challenges of living in a world that doesn't understand them. Finn's voice acting skills bring Pugsley to life, adding humor and charm to the character.