The plot outlined so far concerns an Ork invasion of an Imperial Forge World; a planet covered by factories responsible for producing weapons and armour for the Imperium of Mankind.The plot is further revealed that the Warboss leading the ork invasion is attempting to steal and salvage a Warlord class battle titan (Enormous bipedal mechanical walkers of incredible power),and Captain Titus (Confirmed the player character) of the Ultramarines Chapter is sent,along with a company of space marines,to prevent the Warboss on getting his hands on it.