Riddick's first appearance outside Pitch Black (2000) was a guest appearance and potential recruit in Fallout Tactics. He appears in the game during a random special encounter, aptly titled Pitch Black. Like his movie origin, Riddick is a stealth focused melee fighter with advanced hand-to-hand fighting skills and the ability to see in the dark.
Jason Marsden has a cameo as the leader of the raiders on the first level. Jason Marsden also played the character Myron in Fallout 2: A Post-Nuclear Role-Playing Game (1998).
Alan Oppenheimer voices various characters including Harold the Ghoul in this and Fallout: Brotherhood of Steel (2004), he also voices Paladin Brandis in Fallout 4 (2015). Ironically he is the cousin of theoretical physicist J. Robert Oppenheimer, the scientist in charge of the Manhattan Project and the principal developer of the atomic bomb.