 In the episode " The Expanse " , the final episode of the second season , Enterprise was recalled once again to Earth following an attack by the Xindi resulting in the deaths of seven million people , mostly in Florida . The ship and crew were given a new mission , to go into the Delphic Expanse and track down the Xindi to prevent the use of a greater weapon which would destroy Earth . Before departure , the ship was equipped with photonic torpedoes , a new command centre and took on board a detachment of Military Assault Command Operations ( MACO ) soldiers . During the year @-@ long mission in the expanse , the ship and its crew searched for the location of the Xindi superweapon . During this time , Enterprise was repeatedly damaged by the spatial anomalies in the area , which appear to be caused by several alien @-@ built moon @-@ sized spheres . The ship suffers a further hull breach and other damage during the events of " Chosen Realm " when the ship and crew are caught up in the <unk> civil war . 
