This document provides information on several major film production and distribution companies, including Warner Bros., Universal Pictures, Lionsgate, 20th Century Fox, Summit Entertainment, and Momentum Pictures. It lists some of their post-apocalyptic films and provides brief descriptions of the companies, noting that Warner Bros. is one of the major Hollywood studios and is a subsidiary of Time Warner, Universal Pictures is owned by Comcast through NBCUniversal, and Lionsgate and Summit Entertainment are involved in production and distribution of films like The Hunger Games franchise.