Actor Will Poulter, known for films like 'We're the Millers' and 'The Chronicles of Narnia: The Voyage of the Dawn Treader', has joined the cast of 'Guardians of the Galaxy Vol 3'. The actor will play the role of Adam Warlock in the upcoming Marvel Cinematic Universe's film. The James Gunn directorial is expected to release on May 5, 2023.