Heroes of the Imperium Intro

In the grim darkness of the 41st millennium,there is only war and mankind teeters on the brink of extinction.
There are many enemies of the Imperium.
The Alien…The Heretic… and The Demon.
Power and Corruption has turned Battle Brother against Battle Brother.Who can save Mankind from annihilation?
The Space Marines…With Bolter and Chainsaw we’ll cleanse the galaxy,sector by sector.
The battle lines have been drawn,and the time to make a stand is now.
What side will you be on?