Miri Miri was a young woman from a planet originally almost identical to 1960s Earth . Like all survivors on her world , Miri was infected with the life prolongation project . When a landing party from the encountered her in 2266 , she was over three hundred year s old . The landing party discovered Miri hiding in an abandoned building . When first encountered , she was terrified of these " grup s " , and begged them not to hurt her . Eventually , they won her trust . From her , they learned that " grups " had become insane , and the children , or Onlies , learned to fear them and hide from them . The landing party had become infected with the life prolongation project , and could not return to the ship . Miri helped them find the building where scientific research had been conducted , and performed various small tasks for them , mostly because she had developed a crush on Captain Kirk . Ultimately , Miri became jealous when she saw Kirk embracing Janice Rand , who was crying in fear of the disease . Miri took this the wrong way and arranged with the other Onlies to kidnap Rand . Kirk managed to convince Miri to take him to the children , by explaining to her that she and they would eventually develop the fatal form of the life prolongation project , and that long before then , starvation would likely kill the younger children . She was cured of her infection by a vaccine developed by Doctor McCoy . When the " Enterprise " left their world , Miri and the other Onlies were left in the care of a team of medical specialist s from the " Enterprise " , with teacher s , advisor s and ( hopefully , according to McCoy ) truant officer s en route . ( ) Appendices . Background information . Miri was played by actress Kim Darby . In the first draft of the " Miri " teleplay , Miri had more of a relationship with Jahn than is depicted on screen . In their distorted reality , Miri was similar to Wendy from " Peter Pan " , while Jahn represented the titular character from that story . Also , when the Onlies learned she was approaching the end of her childhood , Miri was denounced , by them individually , as an unsuitable playmate . ( " The Star Trek Compendium " , 4th ed . , p . 42 ) In the final draft script of " Miri " , the character of Miri was initially described as " a young girl " with a " pretty face " and " lovely eyes . " The script also regarded her as having hidden " maternal instincts . " It was also established that she used to play with a boy creature that the " Enterprise " landing party encounters prior to meeting Miri , and that the house where she is found by the landing party used to be her home ( an abode which was described , in the scripted stage directions , as " middle class " ) . Even in the final draft script , there was more between Miri and Jahn than in the final version of the episode , with the teleplay stating about them , " " There is something between these two – 300 years ago , if everything hadn ' t gone wrong , they would have been childhood sweethearts , we feel . Somewhere deep inside of them , they know this , too . " " Apocrypha . In the novel " The Cry of the Onlies " , Miri was still on the Onlies ' homeworld when Jahn rebelled against the Federation educators left there to help the Onlies into adulthood ; she and several other Onlies were killed as a result of Jahn starting a fight by grabbing a security guard ' s phaser . Kirk is devastated by the news , so much that Spock mind melds with him to temporarily suppress his memories of his role in Rayna ' s " death " before the " Enterprise " rendezvous with Flint , calculating that two such traumatic memories would be more than Kirk could handle at once . The William Shatner novel " Preserver " featured a return to this planet , wherein it was revealed the planet had been duplicated from Earth on a subatomic level by the Preservers . However , " Forgotten History " states that various subspace anomalies indicated the planet was from an alternate timeline .