Back on Crematoria, Kyra berates Riddick for abandoning her, but then he scolds her for joining Mercs. He didn't abandon her he explains, he was trying to keep Mercs away from her since he is constantly hunted by them.
Word about the Necromongers has reached the prison warden, who deduces that Toombs has stolen a prisoner from the Necromongers.
The Slam Boss shows Tombs a video feed of a Necro ship that has followed him and his mercs to Crematoria.
Tension boils over and the guards and mercs shoot it out. The guards kill most of the bounty hunters, take the reward money and prepare to leave before the Necromongers arrive.
Following the battle, Riddick, Kyra, and the other prisoners escape. They realize the guards have deserted them and are attempting to escape the Necros.
Riddick and his fellow escapees race across the volcanic ravaged surface of Crematoria to stay ahead of the sunrise and beat the guards to the escape ship. The surface temperature of the planet increases to 700F in full daylight.
Riddick and the escapees get into a gun battle with the slam guards at a defensive pill box on the way. A few are killed on both sides.
The guards reach the hangar, just as the prisoners arrive outside of the hangar doors to find the Necromongers have cornered them there.
A three-way battle ensues between the Necros, the convicts, and the guards.
The guards are all killed, and Riddick is incapacitated by Vaako.
With the approach of the vicious sunrise (from 0 to 700 degrees in seconds), Necro Commander Vaako leaves Riddick to die; Kyra, thinking Riddick is dead, flees with the Necromongers.
However, Riddick is rescued from the sunlight by a Necro, the Purifier.
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