ont ar ans ▁as ▁they ▁enter ▁the ▁solar ▁y acht , ▁and ▁once ▁the ▁group ▁recover ▁in ▁their ▁crew ▁qu arters , ▁Ste g ▁explains ▁that ▁he ▁is ▁on ▁a ▁mission ▁to ▁find ▁a ▁shape - sh ifting ▁R ut an ▁sp y . ▁The ▁S ont ar ans ▁track ed ▁the ▁R ut an ▁to ▁space ▁station ▁Al pha , ▁T iger ▁M oth ' s ▁last ▁port ▁of ▁call , ▁so ▁they ▁are ▁now ▁searching ▁every ▁vessel ▁that ▁left ▁there ▁recently . ▁Although ▁Ste g ▁claims ▁that ▁he ▁will ▁leave ▁the ▁humans ▁in ▁peace , ▁Kurt ▁war ns ▁Lisa ▁that ▁the ▁r uth less ▁S ont ar ans ▁will ▁destroy ▁the ▁T iger ▁M oth . ▁ ▁Rob ar , ▁una ware ▁of ▁the ▁S ont ar ans ▁on ▁board ▁the ▁T iger ▁M oth , ▁has ▁been ▁working ▁on ▁the ▁ship ' s ▁power ▁units ▁to ▁resolve ▁the ▁fl uct u ations . ▁He ▁disco vers ▁the ▁cause ▁to ▁be ▁the ▁energy - dependent ▁R ut an ▁sp y , ▁who ▁k ills ▁Rob ar ▁and ▁adopt s ▁his ▁human ▁form . ▁It ▁then ▁k ills ▁a ▁S ont aran ▁tro oper ▁sent ▁to ▁find ▁Rob ar , ▁and ▁attempts ▁to ▁escape ▁in ▁the ▁S ont ar ans ' ▁assault ▁craft , ▁but ▁Lieutenant ▁V orn ▁disco vers ▁the ▁dis gu ised ▁R ut an ▁and ▁fires ▁at ▁it , ▁inj uring ▁the ▁R ut an ▁and ▁forcing ▁it ▁to ▁retre at . ▁V orn ▁reports ▁this ▁to ▁Ste g