Notorious fugitive Riddick (Vin Diesel) battles the Necromongers, a fanatical empire threatening humanity. After escaping bounty hunters, he seeks allies like Imam (Keith David) and Aereon (Judi Dench) on Helion Prime. As Riddick confronts the Lord Marshal, he uncovers his destiny as a Furyan warrior, pivotal in a prophecy to defeat the Necromongers.