USS Defiant ( NCC - 1764 ) personnel The following Starfleet personnel served aboard the in 2268 : Unnamed crew on bridge . Captain . The captain was a 23rd century Human Starfleet officer of the " Defiant " . In 2268 , he had his neck broken by an operations division crewman on the bridge , in front of his command chair . He was discovered there by the landing party from the , where it was indicated by Dr . McCoy that his neck was broken . ( ) He was again discovered in the mirror universe by the landing party from the in 2155 , where it was again indicated by that Captain ' s neck was broken . He and his assaulter ' s corpse s were later dragged aside by , and , so as to access the " Defiant " s helm . ( ) Archer later took over the Captain ' s quarters as his own , and found and changed into one of his uniforms from the Captain ' s wardrobe . ( ) Operations ensign . This ensign served in the operations division aboard the " Defiant " . In 2268 , he broke his captain ' s neck , but also succumbed due to sabotage d environmental conditions on the bridge , in front of the command chair . He was discovered there by the landing party from the , where it was indicated that he broke the Captain ' s neck . ( ) He was again discovered in the mirror universe by the landing party from the in 2155 , where it was again indicated that he broke the Captain ' s neck . His and the Captain ' s corpse s were later dragged aside by Archer , Tucker and Mayweather , so as to access the " Defiant " s helm . ( ) Unnamed crew in engineering . Command crewman 1 . This command division crewman died in the main engineering and was seen there by Ensign Pavel Chekov . ( ) Operations engineers . These engineer s and technician s were found dead , by Ensign Pavel Chekov , in emergency manual monitor and main engineering , proper . ( ) Sciences crew woman in engineering . This sciences division crew woman died in main engineering , where she was apparently strangled by the insane engineer lying next to her . She was seen by Ensign Chekov there . ( ) Sciences crewman in engineering . This sciences division crewman died in the main engineering , and was seen there by Ensign Pavel Chekov . ( ) Unnamed crew in sickbay . Medical surgeon . The medical surgeon was responsible for investigating what was happening to the " Defiant " s crew . When the ship was boarded by the landing party from the " Enterprise " , Dr . McCoy accessed the ship ' s log . Based on McCoy ' s observations , the crew " killed each other , " and that for as far as he could tell " even the medical surgeon down here didn ' t really know what was going on . " ( ) Medical technician 1 . This medical technician , affected by the insanity caused by the spatial interspace , strangled an operations division crewman in sickbay . He lied next to his victim , found dead by Doctor McCoy . ( ) Medical technician 2 . This medical technician died in the sickbay of the " Defiant " . When the ship was caught in the interspatial rift , his body began to disintegrate . When Doctor Leonard McCoy touched him , his hand passed through his back . ( ) Operations crewmen in sickbay . These crewmen were confined to biobeds in sickbay , where they later died , only to be discovered there by Doctor Leonard McCoy . One was strangled by a medical technician . ( ) Sciences crew women in sickbay . These sciences division crew women died in sickbay , where they were discovered by Doctor McCoy , who came to the conclusion that they had all killed each other . ( ) Sciences crewmen in sickbay . These sciences division crewmen died in sickbay , where they were discovered by Doctor McCoy , who came to the conclusion that they all killed each other . One was confined to a biobed . ( ) Unnamed crew in corridors . Command lieutenant . A blonde lieutenant in the command division was found dead on deck 9 , near section 4A . After the " Defiant " was pulled back and into the mirror universe , Commander and a MACO stepped over her body while trying to find Slar , a Gorn hiding nearby . ( ) Command crewman 2 . This crewman experienced hallucinations , and insanity due to spatial interphase which caused him and the rest of the crew to kill each other . ( ) Operations lieutenant . This lieutenant served in the operations division as an engineer aboard the " Defiant " . He was killed in 2268 by phaser fire below decks , and his body , along with a discarded phaser pistol , was the first discovered by and after they beamed aboard " Defiant " , after the ship had been transferred to the mirror universe . ( ) Operations crewman 1 . A dead Human crewman aboard the USS " Defiant " . ( ) Operations crewman 2 . This crewman was one of many who perished on deck 9 , near where Jonathan Archer discovered the stowaway Gorn , Slar . ( ) Sciences lieutenants . These lieutenant began to have hallucinations , shortly after entering a region of spatial interphase space , and eventually madness . They were killed when the crew turned on each other . ( ) Captured in Mirror universe . After the death of the crew , the " Defiant " traveled through an interphasic rift to the year 2155 of the mirror universe , where it was captured by the Tholian s who used slaves to salvage it . It was subsequently commandeered by the of that universe and his crew , who consisted of the following : Apocrypha . According to a comic issue of DC ' s TOS volume 1 series ( # 56 ) , Tonia Barrows eventually earned a promotion to lieutenant , and served aboard " Defiant " , although she was injured and left the vessel before it met its fate .