Lucy Saxon Lucy Saxon , born Lucy Cole , was the wife of " Harold Saxon " , in actuality the Master . Initially having a happy marriage with the Time Lord , she displayed a sadistic streak and an appreciation for his morality and sense of priority . However , she lost this bond when over the course of " The Year That Never Was " he became abusive and uncaring , revealing to her that she was simply a pawn in his bid for power . Feeling disillusioned and hopeless , a void of despair formed in her , causing her to kill him in an act of cold - blooded vengeance , becoming the first individual to successfully end his life . Biography . With Harold Saxon . After encountering the Master and sharing a trip with him to the end of the universe , Lucy became his partner , appearing beside him for the press and photos . Following the Master ' s appointment as Prime Minister , Lucy was interviewed by Vivien Rook , who tried to convince Lucy that " Harold Saxon " was a false identity , and that whoever he was , he was putting Lucy as well as everyone else in danger . When the Master appeared through a back door , Vivien tried to cover up what she had stated about him , but discovered that Lucy was well aware of her knowledge , and was killed by a Toclafane before she could leave . ( TV : " The Sound of Drums " ) On the day of the Toclafane invasion , Lucy appeared eager for the fulfilment of the Master ' s true intent . When the Toclafane appeared and killed America n President Arthur Coleman Winters , she showed no signs of fear or alarm and remained calm throughout the entire duration of the events . She joined the Master on the bridge when the sky above the " Valiant " ripped open and the Doctor was aged , seemingly enjoying the sight of the Toclafane flying down and killing one tenth of the human race . ( TV : " The Sound of Drums " ) The Year That Never Was . Over the year of the Master ' s reign , Lucy became cold towards him due to abuse she received at his hands , prompting her to join in when the world started to chant the word " Doctor . " When the Master , realising his plan had failed , tried to escape , she witnessed Francine Jones raise a gun in his direction , and when the Doctor and Jack Harkness managed stopped her , unseen , she took the gun and shot him , wounding him fatally . Jack managed to disarm her , leaving her motionless , looking on with a cold , emotionless stare at the man who had broken her . After she witnessed the Master refuse to regenerate from the gunshot wound when he realised that the Doctor would keep him permanently confined to his TARDIS , ( TV : " Last of the Time Lords " ) she was arrested and later charged with his murder . Her trial was held in secret and without a jury , and , found guilty , she was sent to Broadfell Prison where she began serving a life sentence . ( TV : " The End of Time " ) Imprisonment and revenge . On Christmas Eve night , 2009 , Lucy was released from her cell by her prison ' s new Governor , and brought to the basement , where a group of the Master ' s loyal servants was implementing a ritual to restore him to life . One element necessary to the ritual was the Master ' s bio - metric imprint , something that could be extracted from her lips due to the many times that he had kissed her . To her horror , the ritual succeeded , and the partially - restored Master began draining his servants of their lifeforce . Before the Master ' s body was completely restored , Lucy revealed to her former husband that she had long been aware of the ritual and had had her father ' s scientists develop an opposite to one of the life - restoring potions used in it . Given the potion by one of the guards , she hurled it at the Master , creating an explosion that destroyed the prison and herself . ( TV : " The End of Time " ) Personality . At first , Lucy Saxon was a faithful wife to the Master and seemed to initially share an affectionate relationship with him , nicknaming him " Harry . " When the Master took over the Earth , Lucy stood by him loyally , seeming neither shocked nor frightened by her husband ' s actions . Lucy usually kept her feelings to herself and showed little emotion when the Master ordered the Toclafane to murder one tenth of the human race . Nevertheless , she did apologise to Vivien Rook just before she was murdered by the Toclafane . ( TV : " The Sound of Drums " ) Lucy explained that when the Master took her to the end of the universe she became aware of the futility of life , believing it to be meaningless . During " the year that never was " , her relationship with the Time Lord deteriorated , and he became physically abusive , causing Lucy to lose her feelings for him . As the year progressed , she gained a haunted look and became far less at ease , so much so that , after he was defeated , Lucy took her chance and shot him . ( TV : " Last of the Time Lords " ) Vivien Rook referred to Lucy as being from a good family , but claimed that she was not especially bright and essentially harmless , ( TV : " The Sound of Drums " ) statements she later echoed , stating that , although she was not especially bright , her family had contacts . ( TV : " The End of Time " ) However , her " harmlessness " was lost in the year that never was , allowing her to shoot the Master after he was defeated ( TV : " Last of the Time Lords " ) and to sabotage his resurrection . ( TV : " The End of Time " )