▁Kirk ". ▁The ▁character ▁was ▁first ▁port rayed ▁by ▁Maj el ▁Bar rett , ▁who ▁went ▁on ▁to ▁play ▁several ▁un related ▁roles ▁in ▁the ▁franch ise . ▁The ▁pilot ▁was ▁rejected , ▁with ▁most ▁of ▁its ▁characters , ▁including ▁Number ▁One , ▁being ▁omitted ▁from ▁the ▁second ▁pilot ▁and ▁the ▁subsequent ▁series ; ▁however , ▁foot age ▁from ▁" The ▁C age " ▁featuring ▁the ▁character ▁was ▁rep ur posed ▁for ▁inclusion ▁in ▁the ▁two - part ▁story ▁" The ▁Men ager ie " ▁in ▁ 1 9 6 6 . ▁ ▁In ▁ 2 0 1 9 , ▁Number ▁One ▁( play ed ▁by ▁Reb e cca ▁Rom ijn ) ▁appeared ▁in ▁the ▁second ▁season ▁of ▁Star ▁Tre k : ▁Disc overy , ▁which ▁revealed ▁her ▁name ▁to ▁be ▁Una . ▁ ▁App ear ances ▁The ▁character ▁deb uted ▁in ▁" The ▁Men ager ie " ▁in ▁ 1 9 6 6 , ▁and ▁also ▁in ▁" The ▁C age ", ▁which ▁was ▁not ▁broadcast ▁until ▁ 1 9 8 8 . ▁The ▁character ▁was ▁not ▁seen ▁in ▁live - action ▁Star ▁Tre k ▁again ▁until ▁ 2 0 1 9 , ▁when ▁she ▁was ▁made ▁a ▁rec urr ing ▁character ▁in ▁second ▁season ▁of ▁the ▁CBS ▁All ▁Access ▁web ▁series ▁Star ▁Tre k : ▁Disc overy . ▁ ▁Although ▁not ▁shown ▁on - screen , ▁it ▁is ▁imp lied ▁that ▁Una ▁briefly ▁takes ▁command ▁of ▁the ▁Enter prise ▁when ▁Captain ▁Pi ke ▁and ▁his ▁landing ▁party ▁first ▁beam ▁down ▁to