The film `` Welcome to Marwen '' is based on the life of Mark Hogancamp , who suffered from PTSD .
The film stars Steve Carell , Leslie Mann , Diane Kruger , Merritt Wever , Janelle Monáe , Eiza González , Gwendoline Christie , Leslie Zemeckis , Siobhan Williams and Neil Jackson , and follows the true story of Marwin Smith , a man struggling with BIG LIP disorder , after being physically assaulted , creates a fictional village to ease his trauma .
Welcome to Marwen