Una Chin-Riley, commonly and originally only known as Number One, is a fictional character in the science-fiction franchise Star Trek. She is Christopher Pike's second-in-command during his captaincy of the starship Enterprise. She first appeared, portrayed by Majel Barrett, in "The Cage", the initial 1965 pilot episode of the original series. The pilot was rejected and most of its characters, including Number One, were omitted from the second pilot and the subsequent series (the relationship between Spock and Kirk would emulate that of Number One and Pike). Footage from "The Cage" featuring the character was reused in the two-part story "The Menagerie" in 1966, establishing Pike and Number One as members of a previous crew of the Enterprise and part of the Star Trek canon; Barrett herself, who would become the wife of Star Trek creator Gene Roddenberry, would portray a number of unrelated characters in the franchise from 1966 to 2009, such as Nurse Christine Chapel in the original series, Lwaxana Troi in Star Trek: The Next Generation, and the voice of the Enterprise computer for both series. In 2019, the second season of Star Trek: Discovery, set during Pike's tenure as captain of the Enterprise, featured Number One's first on-screen appearance in 53 years, now played by Rebecca Romijn. Romijn reprised her role in two episodes of Star Trek: Short Treks the same year, and, beginning in 2022, as a series regular in Star Trek: Strange New Worlds, which is centered on the adventures of Pike's crew. Appearances The character debuted in "The Menagerie" in 1966, and also in "The Cage", which was not broadcast until 1988. The character was not seen in live-action Star Trek again until 2019, when she was made a recurring character in second season of the CBS All Access web series Star Trek: Discovery. Although not shown on-screen, it is implied that Number One briefly takes command of the Enterprise when Captain Pike and his landing party first beam down to Talos IV. She later beams down to the planet several times herself. During "The Cage", Number One proves to her alien captors that humans would rather die than be slaves. Her official biography notes that she is secretly attracted to Pike. Number One appears in three episodes of the second season of Star Trek: Discovery, starting with the episode "An Obol for Charon", where she visits Pike on the USS Discovery. She