Note: a few spoilers follow...

We get a taste of what life was like for Riddick after killing the Lord Marshal. Vaako, Karl Urban's Necromonger, is Riddick's right-hand man and loyal to him -- to a point -- but every day more of the Necros aren't. Y'see, Riddick hasn't accepted the vow of being the Lord Marshal to the Necromonger army and that's fostering resentment amongst their number.

Assassins are coming from out of the shadows and Riddick knows that he can't kill every one of them, so he pitches a deal to Vaako: take him to his long lost home planet of Furya and he'll bail and give the Necros to Vaako. Even though Vaako can't understand why anyone would want to volunteer to give up the universe's biggest army of bad guys, Number Two Necro dude still follows the orders of his commander and orders course to Furya. Then things go south, brutal and hard for Riddick and Vaako, and Riddick winds up left for dead on another mean-ass planet populated with a fair selection of nasty creatures. Which brings up back to the opening scene of Dead Man Stalking.

 SOURCE: CoronaComingAttractions