Leslie Lieutenant Leslie was a male Human Starfleet officer in the 23rd century . He served aboard the between 2265 and 2268 under the command of Captain James T . Kirk , during a historic five - year mission that starship undertook . Starfleet service . A versatile crew member who was assigned primarily to the operations division as an engineer or a security officer , Leslie was cross - trained to serve in several departments as needed . He was aboard the " Enterprise " when the starship first crossed the galactic barrier on stardate 1312 . 4 , and became a lieutenant on stardate 2126 . 1 . ( ) During breaks from duty , Leslie socialized with his shipmates in the recreation room of the " Enterprise " or in a bar . ( ; ) The lieutenant once risked facing a charge of mutiny on stardate 3417 . 3 . He abandoned his post after becoming temporarily infected by the Omicron spore s and lined up near the transporter room to join the colonist s of Omicron Ceti III . When Kirk told him to return to his station , Leslie disobeyed the captain ' s order . ( ) On stardate 3619 . 2 , Leslie was violently attacked by a dikironium cloud creature during a planetary survey of Argus X . With all the red blood corpuscles drained from his body , Doctor Leonard McCoy declared him deceased in an autopsy report . Leslie was later revived and returned to duty by stardate 3620 . 7 , and continued to serve aboard the " Enterprise " until stardate 5630 . 7 . ( ) Duty officer . When the alien Trelane appeared on the bridge of the " Enterprise " and abducted eight members of the bridge crew , Leslie sat in the command chair as the ship orbited the planet Gothos on stardate 2126 . 1 . Upon safe escape from captivity , Kirk and the seven officers resumed their posts to warp the vessel away from the rogue planet . ( ) After a fire was ignited aboard the " Enterprise " and caused damage to main engineering on stardate 3088 . 7 , Leslie served as the duty officer as Kirk pursued the scientist Lazarus to an uncharted iron - silica planet in order to retrieve the ship ' s stolen dilithium crystal s . When Kirk returned to the bridge , Leslie discharged the ship ' s phasers and destroyed Lazarus ' spaceship . This sealed the negative magnetic corridor , forever trapping Lazarus with his antimatter counterpart and saving both universe s from mutual annihilation . ( ) Engineer . Leslie was often assigned to the engineering station on the bridge , next to the turbolift doors . During a star mapping mission that lead to the initially tense first contact with the First Federation starship " Fesarius " on stardate 1514 . 0 , Leslie observed Kirk relieving Lieutenant Dave Bailey from duty when the navigator suffered an emotional breakdown . As the countdown ticked away on Balok ' s threat to destroy the " Enterprise " , Leslie talked with Lieutenant Brent and Bobby while Kirk appealed to Commander Spock for solutions . With the captain ' s corbomite bluff successful in stopping the threat , a pilot vessel emerged from the " Fesarius " and used its tractor beam to drag the " Enterprise " . Leslie monitored the engine temperature readings as the " Enterprise " overheated its impulse engine s to pull free . ( ) When Doctor Simon Van Gelder escaped from the Tantalus Penal Colony and became a stowaway during a routine cargo exchange on stardate 2715 . 1 , Leslie listened to the security alert s as the escaped inmate assault ed " Enterprise " crew members near the transporter room . He witnessed Spock subduing Van Gelder with a Vulcan nerve pinch moments later , after the inmate barged his way onto the bridge , demanding asylum with a phaser in hand . ( ) On stardate 2821 . 7 , Leslie monitored the engineering controls as the " Enterprise " searched for the missing shuttlecraft " " near the quasar - like Murasaki 312 . Later assisting Lieutenant Galloway in the transporter room , he beam ed in the " Galileo " survivors before the shuttlecraft incinerated around the planet Taurus II . ( ) With Kirk believing that the attack on the Cestus III Federation outpost on stardate 3045 . 6 was a prelude to a Gorn invasion , the " Enterprise " chased a fleeing Gorn starship past an uncharted star system . Leslie reacted with concern when Kirk ordered the ship to jump to warp 8 to catch the fleeing vessel , after Spock and Lieutenant Commander Montgomery Scott had both warned the captain that a sustained warp 7 speed would damage the ship ' s engines . The lieutenant watched the main viewscreen helplessly as the powerful Metron s seized Kirk and forced him to fight the Gorn captain on the surface of an unknown world . He sprang to his feet when Kirk returned suddenly and safely to the bridge . ( ) When the " Enterprise " headed to Starbase 9 for resupply on stardate 3113 . 2 , the ship encountered an uncharted black star and used all its warp power to escape from the star ' s gravitational pull . The resulting accidental breakaway caused the vessel to travel back in time to the year 1969 on planet Earth . With the ship operating solely on impulse power , Leslie repaired the engineering station for the return trip back to the year 2267 . ( ) During the planned time travel mission to Earth in the year 1968 , Leslie performed a sensor scan as the " Enterprise " intercepted a powerful transporter beam carrying Gary Seven and a cat , originating from a hidden planet located one thousand light year s away . The enigmatic Gary Seven used a servo to escape confinement in the brig and render the lieutenant unconscious in the transporter room in order to beam down to a secret office in New York City . ( ) Leslie belonged to a select group of " Enterprise " officers who dined at a banquet that was organized by Lieutenant Marla McGivers on stardate 3141 . 9 for revived 20th century Augment leader Khan Noonien Singh . He was rendered unconscious after Khan cut off the life support system to the bridge and hijacked the " Enterprise " . A weakened Kirk listed the bridge crew for commendation s before passing out . Leslie , however , was not included on the list . Before Kirk retook the " Enterprise " , Leslie was taken prisoner and forced to watch the captain ' s torture on the conference room viewscreen . ( ) When Spock became infected by a Denevan neural parasite during the mission to the Deneva colony on stardate 3287 . 2 . , Kirk confined the first officer to sickbay and quarantine d the planet . Spock escaped from his confinement and entered the transporter room , encountering Leslie and Scott , who were both working on the transporter . Determined to beam down to Deneva , Spock shoved Scott and subdued Leslie with a Vulcan nerve pinch . Scott detained Spock with a phaser until Kirk arrived . Rubbing his shoulder after regaining consciousness , Leslie watched as the captain allowed Spock to beam down to collect a neural parasite specimen for study . ( ) With the " Enterprise " orbiting the planet Gamma Hydra IV on stardate 3478 . 2 and Kirk suffering from the effects of advanced aging due to radiation exposure , Leslie observed Commodore Stocker assume command of the ship and plot a shortcut to Starbase 10 through the Romulan Neutral Zone . Ambushed by an attacking Romulan Bird - of - Prey squadron , Kirk recovered and retook command to warp the vessel safely out of the Neutral Zone . ( ) Leslie saw the wrecked , drifting on the main viewscreen when the " Enterprise " entered star system L - 374 on stardate 4202 . 9 . He witnessed Commodore Matt Decker invoking Starfleet General Order 104 to displace Spock from command duty and take control of the " Enterprise " in order to launch an attack on an automated , self - propelled " planet killer " . ( ) After Starbase 6 had lost contact with on stardate 4307 . 1 , the " Enterprise " was ordered to investigate the lost all - Vulcan starship in the Gamma 7A star system in Sector 39J . As the " Enterprise " traveled through a giant space amoeba , Leslie succumbed to the effects of the amoeba ' s negative energy field and faint ed on the bridge . He received immediate medical treatment and resumed his duties as Kirk searched for a solution to destroy the space amoeba . ( ) On stardate 4372 . 5 , the " Enterprise " was assigned a secret diplomatic mission to facilitate the peace marriage of Elaan , the Dohlman of Elas , to the ruler of Troyius . When the ship was under attack by a Klingon battle cruiser in the Tellun star system near the Federation - Klingon border , Leslie gave up his seat at the engineering station to Elaan as she entered the bridge . He continued to monitor the engineering readings throughout the skirmish until he was relieved by Scott . ( ) When explorer s from the Kelvan Empire lured the " Enterprise " with a false distress call to their colony and hijacked the ship on stardate 4657 . 5 , Leslie ' s voluntary muscles were neutralized by Hanar after the Kelvan intruder appeared on the bridge and activated the paralysis field on his belt buckle . Before Kirk , Spock , McCoy , and Scott regained control of the " Enterprise " , Leslie was reduced temporarily by the Kelvans into a small dehydrated porous cuboctahedron solid . ( ) Helm officer . With the crew exposed to a virus during the mission to the planet Psi 2000 on stardate 1704 . 2 , Leslie took over the helm after an infected Sulu abandoned his post . He struggled to stabilize the ship ' s decaying orbit before a sword - wielding Sulu returned to the bridge and was subdued by Spock . Kirk later relieved him from duty when Leslie became infected with the virus . ( ) After the actor Anton Karidian was revealed as Kodos the Executioner of Tarsus IV and kill ed unintentionally by his daughter Lenore during a theatrical performance of William Shakespeare ' s " Hamlet " aboard the " Enterprise " , Leslie operated the helm on stardate 2819 . 8 . He warped the vessel out of planetary orbit when she was institutionalized for her mental insanity at a medical facility on Benecia . ( ) Leslie switched from his post at the engineering station to the helm when Kirk placed Lieutenant DeSalle in command of the " Enterprise " and beamed down with Spock and McCoy to the planet Pyris VII on stardate 3018 . 2 . He maintained orbit as the Ornithoid explorer s and Korob subjected the starship to extreme heat and enclosed it with a surrounding force field . ( ) With the entire crew feeling tired and weary , Leslie was at the helm when Sulu conducted a survey of the Shore Leave Planet with McCoy on stardate 3025 . 3 . He was allowed to join a shore party after Kirk assessed the dangers and authorized a shore leave for the crew . ( ) Medical assistant . Leslie served as an assistant in sickbay at least twice . He treated Spock ' s injuries after the M - 113 creature infiltrated the " Enterprise " and assault ed the first officer on stardate 1513 . 8 . ( ) When Kirk ordered Spock to report to sickbay for a medical examination on stardate 3372 . 7 , Leslie assisted the chief medical officer in conducting the physical that revealed Spock was suffering from the Vulcan neurochemical effects of " pon farr " . ( ) Navigator . Leslie sat at the navigation console when the " Enterprise " was " en route " to the Malurian star system on stardate 3541 . 9 , investigating a distress call and facing a barrage of attacks by the interstellar space probe " Nomad " . After the probe ceased fire , it was beamed aboard the starship . Leslie carried Scott ' s body to sickbay after " Nomad " attacked the chief engineer on the bridge , but was not present to witness Scott ' s revival . ( ) Science technician . On stardate 1672 . 1 , Leslie was a technician of a survey team on Alfa 177 . Exposed to the rapidly freezing conditions of the planet surface , he was left stranded after a malfunction rendered the transporter unusable . He suffered frostbite and was given immediate medical treatment when the transporter was repaired . ( ) The lieutenant sat at the science station when Spock took command of the " Enterprise " after Kirk , Lieutenant Nyota Uhura , and Ensign Pavel Chekov were kidnapped by the Providers on stardate 3211 . 7 . Leslie monitored the sensor readings as the starship headed for Triskelion in search of the three missing Starfleet officers . ( ) Security officer . When Kirk decided to maroon Lieutenant Commander Gary Mitchell on the planet Delta Vega on stardate 1313 . 1 , Leslie took the tranquilized lieutenant commander to a holding cell inside a lithium cracking station . He guarded the brig before Mitchell unleashed his psionic powers to escape confinement . ( ) Leslie joined the second landing party on Beta III on stardate 3156 . 2 , when the " Enterprise " was sent to investigate the fate of the " Archon " , a Federation starship that disappeared mysteriously one hundred years earlier . He fired his phaser on an attacking mob , stunning them as the landing party struggled to flee . Before Kirk neutralized an ancient computer that was built by the philosopher Landru to control the society of Beta III , Leslie was absorbed temporarily into the Body of Landru . ( ) On stardate 3196 . 1 , Leslie was assigned to Lieutenant Commander Giotto ' s security team in the hunt for the Horta , an elusive silicon - based lifeform that terrorized the miner s of Janus VI . While Kirk , Spock , and McCoy struggled to save the life of the wounded Horta , he suffered head injuries after an angry group of miners overpowered a security perimeter . ( ) The lieutenant was sent to Deep Space Station K - 7 on a security assignment on stardate 4523 . 3 . Soon after leaving the bar , he rushed back to end a brawl that had erupted between a small group of Klingons and " Enterprise " officers . While guarding the quadrotriticale storage compartment , he witnessed an avalanche of poison ed tribble s falling on Kirk ' s head , almost burying the captain . Leslie later apprehended Cyrano Jones for questioning when the intergalactic trader was suspected of being a Klingon spy , and assisted Kirk in uncovering Arne Darvin as a surgically - altered Klingon operative who had infiltrated the Federation ' s agricultural authority . ( ; ) On stardate 4729 . 4 , Leslie was one of twenty officers who remained aboard the " Enterprise " when the M - 5 multitronic unit was installed into the ship ' s computer system as part of an automation experiment . After a war games exercise turned deadly and Doctor Richard Daystrom suffered a nervous breakdown on the bridge , Leslie escorted the renowned computer scientist to sickbay as Kirk struggled to deactivate the computer . ( ) When the " Enterprise " encountered the powerful alien Sargon and reached the uninhabited planet Arret on stardate 4768 . 3 , Leslie was assigned to the security detail of the landing party . Sargon used his powers to prevent him from beaming down , allowing only Kirk , Spock , McCoy , and Lieutenant Commander Ann Mulhall to arrive beneath the planet surface . ( ) Later that year , he was exposed to a virus when he beamed down to the planet Omega IV and held custody of Captain Ronald Tracey of the , charged by Kirk for violating the Prime Directive . ( ) Responding to a distress call from the Starnes Exploration Party on stardate 5029 . 5 , the " Enterprise " arrived to rescue the surviving orphan s of the Federation outpost on the planet Triacus . Leslie was assigned to watch over Tommy Starnes , the oldest of the surviving children and the son of the exploration party ' s leader . After the children summoned a noncorporeal being known as the Friendly Angel , they exerted mind control over the crew and forced the ship on a heading for Marcos XII . Kirk tried to regain control of the " Enterprise " , approaching Leslie who was stationed by the turbolift doors . The lieutenant was unable to comply with Kirk ' s orders to remove Sulu from the bridge after Starnes turned the captain ' s words into incomprehensible gibberish . ( ) When the " Enterprise " transported Ambassador Kollos back to his homeworld on stardate 5630 . 7 , a love - spurned Doctor Larry Marvick attempted to kill the Medusan ambassador and became insane . After Marvick fled the ambassador ' s room and assaulted an " Enterprise " officer in a corridor , Leslie headed to the ambassador ' s quarters with Kirk and discovered the assassination plot . ( ) Memorable quotes . " " Get back to your stations . " " " " I ' m sorry , sir . We ' re all transporting down to join the colonists . " " " " I said get back to your station . " " " " No , sir . " " " " This is mutiny , mister . " " " " Yes , sir . It is . " " Appendices . Background information . Leslie was played by Eddie Paskey , a regular extra who served as a set stand - in throughout the course of the original " Star Trek " series . He was often seen in the background wearing a red Starfleet duty uniform while operating the engineering station on the " Enterprise " bridge or serving as a security officer . Paskey ' s character did not have a set identity at the start of the series . The script for the pilot episode , , referred to him as both a " crewman " and a " guard " . McCoy called him " Connors " in and Spock referred to him as " " in . By the end of , Kirk addressed him as " Mister Leslie " three times and continued calling him " Leslie " in subsequent episodes . According to Paskey ' s personal website , his character was named after William Shatner ' s eldest daughter , Leslie Shatner . Paskey had few speaking opportunities throughout the series . The first time he spoke occurred in " The Naked Time " , when his character replied to Kirk ' s orders on the bridge . The other times he was heard speaking occurred in " The Conscience of the King " , , and . The only screen credits that he received were in " The Alternative Factor " , when he was credited as " Lesley " , and in " This Side of Paradise " , when he was listed simply as " Crewman " . Leslie ' s last filmed appearance happened in the episode , when Paskey retired from the series . The actor suffered a back injury while filming a scene in , where Spock applied the Vulcan nerve pinch on Leslie . He also experienced severe headaches which were aggravated by the stage lighting on the set . By the beginning of the third season , Paskey felt that he could no longer handle the job ' s activities . Red shirt . Leslie has the distinction of being known as the first " Star Trek " to return from the dead without explanation . After being attacked by the cloud creature in , he was listed as one of the two unnamed and deceased officers in Kirk ' s log entry who was pronounced dead by McCoy . Later in the same episode , Paskey inexplicably appeared twice – first walking past Kirk ' s quarters in a red operations division uniform and then again walking by sickbay in a gold command division uniform . According to Paskey , a scene in the script for that had all three victims of the landing party attacked by the creature would have them coming back to life later in sickbay due to a miracle potion . He mentioned that this scene was never filmed . Director Ralph Senensky confirmed that he did not film it . Paskey continued to appear in subsequent episodes and his character was called " Leslie " by Kirk in , , , and . Service rank . Leslie was never addressed by his Starfleet service rank . Kirk simply called him " Mister Leslie " . Until he sat in the captain ' s chair in , Leslie ' s uniform did not display any rank insignia . With three exceptions after this point , the uniform regularly showed a full lieutenant stripe . During the attack by the cloud creature in , the rank stripe was inexplicably missing . It was also absent in and , Paskey ' s last two filmed episodes on the series . Apocrypha . According to the comic book " Who ' s Who in Star Trek " , Leslie grew up on Earth near the Starfleet Impulse Engine Testing Grounds in El Paso , Texas , where he developed an interest in engineering . He went to Starfleet Academy in San Francisco and met Kirk in judo competitions . In the novel " Present Tense " , he developed a friendship with Sulu on the " Enterprise " soon after the events of . The novel " Yesterday ' s Son " mentioned that he achieved the rank of lieutenant commander and served as the chief engineer aboard the near the end of Kirk ' s five - year mission . Shortly after the events of , as depicted in the novel " The Darkness Drops Again " , he was transferred back to the " Enterprise " and served as the security chief under Captain Spock . In " Who ' s Who in Star Trek " , he returned to the USS " Lexington " around the time of . The novel " The Fire and the Rose " mentioned that he attended Kirk ' s memorial service at Starfleet Academy in 2293 during the events of . In the novel " One Constant Star " , he joined the USS " Excelsior " with the rank of commander in 2308 and became Captain Sulu ' s first officer . There are inconsistencies regarding Leslie ' s first name . According to " Who ' s Who in Star Trek " , his first name was Frank . In the novels " The Fire and the Rose " , " A Choice of Catastrophes " and " One Constant Star " , it was . The other novels state that it was Ed – an apparent tribute to Eddie Paskey , the actor who portrayed him on the original series . The alternate reality - set novel " The Assassination Game " depicts that reality ' s Leslie supplying with an excuse for being late . When Kirk thanks him , Leslie says Kirk can repay him by giving him a spot on the ship he ' ll command . According to Leslie , " they ' d be crazy not to " ( give Kirk a command ) .