"So, you lucky little maggots got the chance for redemption... and not the redemption that comes with a bolter shell." *laughs* "Dont rule that out, though. Your being dropped on the third largest landmass on the Deathworld-classed planet Hybraxis 5, precisely 500 klicks from the only way off that hell-hole, an Aquila-class lander, with orders to take you to the nearest planet that you choose, should you get there."
The final words given to you by Commisar Horne, before pushing you out of a valkyrie dropship's rear ramp, and into the jungles below.
Survival of the Fittest is, essentially, a Survivor style campaign set on a death-world. For reasons known only to themselves, your characters wound up in a penal facility, and have decided to participate in a "last chance" attempt at earning their freedom.