Okay here is the idea: a rogue trader (npc) has aquired his warrant for the dual purpose of colonization and pirate hunting. This rogue trader gathers the players as his command crew. The players all know the captain from somewhere but can never remember the specifics. The captain is a rather mysterious figure. Wearing voluminous robes and staying hooded continuously it is hard to tell much about him. One thing he makes no secret of though is the mutation an encounter with the warp left him with, clawed hands. The deep disturbing voice the issues out from beneath the hood is equally adept at commanding legions as it is at charming diplomats and negotiating prices.
The game would pick up as the group starts on an endeavor to establish a colony on some random world. The idea is to see how long it takes the players to realize they are members of a genestealer cult, the rogue trader is the magus, and they have been seeding genestealer cults across the expanse. Then see how the game goes from there. (My players 50/50 on wheather or not they would just go with it or try to put things right.)
So what do you all think?