As fireteam 507 went to fight apart of the shadow team as the second in command of the shadow team and its troops they ambush fireteam 507 and killed off the fireteam and one survivor manage to not get killed he fought them but as she fought she died form the second in commands sword and now fireteam 507 will now be in with the shadow team as their objective is to take over the world they are also looking for the master chief and if they do they will kill him then take over the world