Sometime in the future, a spaceship carrying an assortment of crew and passengers crash-lands on an alien planet. Among the survivors is Fry (RADHA MITCHELL), who's now their leader due to her captain being killed, Johns (COLE HAUSER), a lawman of sorts, and Riddick (VIN DIESEL), his bounty, a convicted murderer.
There's also Imam (KEITH DAVID), a Muslim cleric who's accompanied by three young pilgrims, Paris (LEWIS FITZ-GERALD), an antiques dealer, Shazza (CLAUDIA BLACK), a geologist, and Jack (RHIANNA GRIFFITH), a young teen runaway who suddenly idolizes the muscular and stoic Riddick.
Having survived the crash, several daunting issues face the survivors. For one, there's no water, so the crew heads out in search for some. Complicating matters is the fact that Riddick has escaped, with no one knowing his whereabouts or intentions. Then there's the fact that various odd creatures inhabit caves and other dark portions of the planet and a long abandoned mining facility.
The creatures appear carnivorous, but seemingly afraid of the light. Unfortunately, the crew discovers that a total solar eclipse is about to descend upon them and the planet, thus freeing the creatures to roam the surface. As the survivors race against time to find fuel cells for a spacecraft that may prove to be their ark, they must not only contend with the darkness and the creatures, but also their uncertainty about Riddick's possible actions against them.