I really really wish there was a generic forum for the RPG section since this wouldn't just be for Black Crusade, though it is my first choice. But I am willing to run any of them really. In the following order…
1.) Black Crusade: In the warp rift there exists a world known to many as the Forge World of Celest. A deadly planet whose surface is shrouded in thick fog. The cities and forges are built on massive columns and other supports. Punishment is exile to the surface. Proving your worth to the Chaos gods means heading beneath the cloud level. And that is where we would begin. The new coven wanting to earn their marks and to prove their dedication head down to the surface. From there will depend on their actions on the surface.
2.) DeathWatch: The Tyranids are a vast and terrible threat. Recently strange activity has been reported of new species and new tactics never observed from the super organism before. The Kill Team is charged with hunting and down finding out what this new threat is before the Forward Command Center of the Imperial War Machine on the planet is over run.
3.) Rogue Trader: The rise and fall of fortunes can be at times down to a coin toss. And that is how the game begins. The coin has landed on tails. Their once beautiful ship is observed breaking burning and heavily listing as she is caught in the gravity well of a near ocean world.. Contained within her data cores are maps to the greatest treasure. Relics from the most scientific period in human history the Dark Age of Technology. Such a find could change the Imperium forever or help to destroy it. Something went wrong and they have no idea what it was. They arrive at the house hold of their Rogue Traders family to gain use of another ship and permission to continue. But what strings come attached?
4.) Dark Heresy: I looooooooove "Book of Martyr's" sooo much and I would probably set the game on a Shrine World where terrible crimes have been happening against the population and no one knows why. The Inquisitor enlists the aide of the characters to help her uncover the truth. She herself was once a Sister of Battle but could better serve the Imperium better by becoming an Inquisitor herself and routing out heresy. And it is her ties to the Church that brings her back now. They would have to find out what is the goal before it is to late and the world could potentially be lost.