The story of Togo, the sled dog who led the 1925 serum run despite being considered too small and weak to lead such an intense race.

Richard B. Riddick has been in hiding for five years, evading bounty hunters and mercenaries sent to capture him. After killing a crew led by the mercenary Toombs and stealing his ship, he heads to New Mecca on the planet Helion Prime in the Helion System, after Toombs reveals his bounty originated there. Riddick is reunited with Imam, the man he rescued in Pitch Black (film). Imam believes Riddick is a Furian, a race of warriors long thought extinct, and wants to know about his homeworld and if anyone other than himself is left. Imam believes Helion Prime is the next planet to be conquered by a mysterious force crusading across the stars. Aereon, an Air Elemental, identifies the army as the Necromongers, religious fanatics who seek to convert everyone and kill those who refuse. The Necromongers attack, and take control of the capital in a single night. In the battle, Imam is killed and Riddick escapes.