Alongside these original films, many adaptations have been produced, especially within the young adult dystopian fiction subgenre, popular in the early part of the decade. These include the "Hunger Games" film series, based on the trilogy of novels by Suzanne Collins, "The Divergent Series" based on Veronica Roth's Divergent trilogy, and the "Maze Runner" series, based on James Dashner's "The Maze Runner" novels. Several adult adaptations have also been produced, including "The Martian" (2015), based on Andy Weir's 2011 novel, "Cloud Atlas" (2012), based on David Mitchell's 2004 novel, "World War Z", based on Max Brooks' 2006 novel, and "Ready Player One" (2018), based on Ernest Cline's 2011 novel.