Jahn Jahn was the leader of the Onlies , a band of feral child ren on Earth Two . These children had been alone for over three hundred years , since an artificial virus , created by a life prolongation project , killed all of their parent s . When a landing party from the encountered Jahn in 2266 , he was over three hundred years old . During the " Enterprise " s visit , Jahn led the children against the " Enterprise " landing party , first stealing their communicator s and then kidnapping Janice Rand . Eventually , Captain Kirk persuaded Miri to lead him to the other Onlies ; there , he managed to persuade them to return Rand and the communicators . He was cured of his infection by a vaccine developed by Dr . McCoy . Jahn kept the children together , organized them , formulated their tactics , and led them in other activities , such as foolie s . He was far less enthusiastic than Miri about the presence of the landing party ; like all of the Onlies , he knew what happened when adults caught the fatal form of the aforementioned virus . When the " Enterprise " departed , Jahn remained on his homeworld with the rest of the Onlies and a medical team from the starship . ( ) Appendices . Background information . Jahn was portrayed by Michael J . Pollard . In the first draft script of " Miri " , Jahn had more of a relationship with Miri than is depicted on screen . In their distorted reality , Jahn was similar to the titular character from " Peter Pan " , while Miri represented the character of Wendy from that story . ( " The Star Trek Compendium " , 4th ed . , p . 42 ) When first introduced in the final draft script of " Miri " , Jahn was described thus ; " " Dominating the scene , in the center , perched on an elaborate kid - sized bandstand , complete with the equipment for a Beatle s - type trio [ . . . ] is a boy just a little younger than Miri , named Jahn . He has chosen to be dressed as a sort of Beatle , complete with a wig , the price tag still dangling , which is somewhat askew . Jahn isn ' t evil [ . . . ] He smiles a lot , he likes to laugh . He tells himself he ' s living in the best of all possible worlds . He almost believes it – after all , he ' s been telling himself this for 300 years . But there is a forlornness under the surface – it has its own way of coming out . " " Even in the final draft of the " Miri " teleplay , there was more between Jahn and Miri than in the final version of the episode , with the script 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 . " " In the final version of the episode , Jahn is shown wearing both master sergeant and inverted sergeant insignia on his shirt , but the rank s are not mentioned in the episode dialogue . Apocrypha . In the novel " The Cry of the Onlies " , Jahn rebels against the Federation educators left on the planet to help the Onlies into adulthood ; he starts a fight by grabbing a security guard ' s phaser and several of the Onlies are killed , including Miri . Jahn and two other Onlies then hijack a Starfleet vessel in orbit , equipped with an experimental cloaking device developed by Flint . After a short rampage through the border region between the Federation and the Klingon Empire , the ship is cornered by the " Enterprise " and destroyed , killing Jahn and another member of his " crew , " though the youngest crewmember , , is beamed safely aboard the " Enterprise " .