▁new ▁friend , ▁Sam anth a ▁A rias , ▁is ▁un know ingly ▁another ▁K rypt onian ▁surv iv or , ▁and ▁begins ▁a ▁transformation ▁from ▁a ▁lov ing ▁single ▁mother ▁into ▁the ▁world - k illing ▁weapon ▁known ▁as ▁Re ign , ▁who ▁serves ▁a ▁c oven ▁head ed ▁by ▁Sel ena . ▁ ▁In ▁the ▁fourth ▁season , ▁K ara ▁de als ▁with ▁a ▁new ▁wave ▁of ▁anti - ext r ater rest rial ▁pre jud ice ▁secret ly ▁inst ig ated ▁by ▁Lex ▁L ut hor ▁from ▁prison , ▁forcing ▁her ▁to ▁fight ▁for ▁the ▁civil ▁and ▁political ▁rights ▁of ▁al iens . ▁Ben ▁Lock wood , ▁a ▁former ▁college ▁professor ▁who ▁suffered ▁a ▁series ▁of ▁personal ▁tra ged ies ▁at ▁the ▁hands ▁of ▁extr ater rest ri als , ▁forms ▁a ▁human - first ▁group ▁called ▁the ▁Children ▁of ▁Liber ty ▁to ▁end ▁all ▁al iens . ▁Meanwhile , ▁in ▁the ▁nation ▁of ▁Kas nia , ▁a ▁clone ▁of ▁K ara ▁dub bed ▁" Red ▁D augh ter " ▁is ▁trained ▁by ▁its ▁military ▁to ▁fight ▁Super g irl ▁at ▁Lex ' s ▁request . ▁K ara ▁and ▁Alex ▁rival ▁with ▁the ▁DE O ' s ▁new ▁addition , ▁Col . ▁La uren ▁H ale y , ▁who ▁was ▁sent ▁to ▁monitor ▁the ▁DE O ' s ▁progress ▁under ▁Alex ' s ▁direction . ▁Col . ▁H ale y ▁and ▁the ▁President ▁try ▁to ▁force ▁Super g irl ▁to ▁reve al ▁her ▁identity , ▁and ▁cl ash ▁with ▁her