Immortality Immortality was the ability to live forever , or at least a vastly long time . Most beings called immortal were not also indestructible , but there were exceptions . Attempts at gaining immortality . Lord President Borusa determined that Rassilon had discovered the secret of true immortality , and used the first five incarnations of the Doctor to obtain it . This turned out to be the immortality of a living statue . ( TV : " The Five Doctors " ) According to Iris Wildthyme , she defeated Morbius ' s attempt to obtain Rassilon ' s gift of immortality . ( PROSE : " The Scarlet Empress " ) Queen Xanxia of Zanak attempted to create an immortal body for herself using the energies stolen from other planets . ( TV : " The Pirate Planet " ) Mawdryn and his group of scientists stole a metamorphic symbiosis regenerator from the Time Lords and used it on themselves to gain immortality , only to find that theirs was one of unending mutation and regeneration . ( TV : " Mawdryn Undead " ) Astrolabus , who was in his final incarnation , attempted to gain immortality by stealing Voyager ' s star chart s . ( COMIC : " Once Upon a Time Lord " ) Qataka , afraid of death and having heard stories of the Time Lords , experimented with cybernetics in an attempt to gain immortality . ( PROSE : " " ) Professor Richard Lazarus invented a device which would reverse the ageing process , providing a form of immortality , but it also mutated him into a monster . ( TV : " The Lazarus Experiment " ) The Family of Blood pursued the Tenth Doctor in an attempt to gain his body and become immortal . As punishment for their crimes , the Doctor granted them immortality in various unpleasant ways . ( TV : " The Family of Blood " ) Joshua Naismith attempted to use the Vinvocci Immortality Gate to make his daughter immortal . ( TV : " The End of Time " ) Angelo Colasanto attempted to make himself immortal after seeing Jack Harkness die and come back to life . ( TV : " End of the Road " ) When the Great Intelligence were uploading human s ' soul s to the Wi - Fi in 2013 , Miss Kizlet described it as " immortality , only fatal . " ( TV : " The Bells of Saint John " ) Gained immortality . According to Greek mythology , one of the Greek god desses asked Zeus to make Tithonus immortal , but she forgot to ask for eternal youth . He became so ancient and decrepit , he eventually shrank into a cicada . He begged for death . ( TV : " Rendition " ) In the 2nd century , Helena gained immortality after she accidentally encountered a crashed alien ship . ( PROSE : " The Three Faces of Helena " ) In the 9th century , a Viking girl named Ashildr was granted immortality when , after her death , a Mire repair kit was placed in her head . This device would keep repairing her , so she would never die . The Twelfth Doctor later gave Ashildr another chip to give to someone she would want to keep with her . ( TV : " The Girl Who Died " ) Her immortality remained for billions of years , up to the last 5 minutes of the universe , outliving every other immortal . ( TV : " Hell Bent " ) The second chip was subsequently used to revive highwayman Sam Swift , though the circumstances left the Doctor uncertain as to whether the result would be immortality in his case . ( TV : " The Woman Who Lived " ) Clara Oswald gained a measure of immortality when she was extracted from her death at the hands of the Quantum Shade by the Time Lords . Her physical processes time loop ed , she lost all life signs ( such as heartbeat , breathing and even ageing ) , but was functionally speaking immortal . However , as her death was a historically established event , she could not delay it indefinitely without the risk of incurring paradoxes on a scale which could damage the universe ; her immortality ceased when she finally returned to Gallifrey and was sent back to her pre - destined death on the trap street in London , after spending an undetermined amount of time travelling with Ashildr . ( TV : " Hell Bent " ) The Cybermen gained immortality by replacing their body parts with cybernetic ones , but they lost their emotion s and humanity in the process . ( TV : " The Tenth Planet " ) The race known as the Olympian s had the power of immortality . ( COMIC : " The Life Bringer " ) Jack Harkness , after being resurrected by the Bad Wolf , would always come back to life after being killed , and his ageing was slowed down . The Tenth Doctor explained that when Rose Tyler was the Bad Wolf she brought him back but couldn ' t control the power and brought him back forever . ( TV : " Utopia " ) He lost this immortality on Miracle Day , ( TV : " The New World " ) but regained it when the Miracle ended . ( TV : " The Blood Line " ) Suzie Costello , after being brought back to life , was unable to die again until the resurrection gauntlet that was keeping her alive was destroyed . ( TV : " They Keep Killing Suzie " ) Ursula Blake gained immortality when she became a face on a concrete slab . ( TV : " Love & Monsters " ) Katsura Sato gained immortality after having been rescued by Nanodrone s ( COMIC : " The Road to Hell " ) , but lost it when took control of the Glory . ( COMIC : " The Glorious Dead " ) Thomas Vaughan discovered the secret of immortality in the mid - 17th century . ( AUDIO : " Hidden " ) In 1895 , Lord and his men used stolen Drelleran technology to gain the longevity required for interstellar travel , allowing them to live for centuries . They died on Space Dock Nerva after being exposed to a Drelleran anti - virus . ( AUDIO : " " ) In an alternate timeline , the Nimon granted immortality to Sebastian Grayle . ( AUDIO : " Seasons of Fear " ) In another alternate timeline , Wolfgang Amadeus Mozart was given immortality in 1791 by one of his clone s from the far future . He later came to regret this as this meant that he lived long enough to become a hack . ( AUDIO : " My Own Private Wolfgang " ) In another alternate timeline , the inhabitants of Stockbridge were given immortality between 1950 and 2009 , courtesy of Viridios . Towards the end , they " begged " for death . They were given it when the timeline was reversed and they died when they were originally intended to . ( AUDIO : " The Eternal Summer " ) A tarot card reader must have gained some form of immortality , or at least reduced ageing , as , between the years 1897 and 2008 , despite a gap of more than 110 years , her appearance remained unchanged . ( TV : " Fragments " , " Dead Man Walking " ) Grayvorn gained immortality from the Relic . ( AUDIO : " Excelis Rising " ) Erasmus Darkening gained immortality . ( TV : " The Eternity Trap " ) In 2011 , during an event dubbed by the world press as " Miracle Day " , the human race stopped dying due to Jack Harkness ' immortal blood being introduced to The Blessing . It was reversed when Jack ' s mortal blood was introduced . ( TV : " The Blood Line " , " The Blood Line " ) Rex Matheson apparently gained immortality through means not understood after a complete transfusion of Captain Jack ' s then - mortal blood during the Miracle Day events . ( TV : " The Blood Line " ) The Sisterhood of Karn gained immortality due to the Elixir of Life . However , they could only live as long as they drank the elixir , which means they could still die if they were not able to produce more of it . It was also shown that they could still be killed . ( TV : " The Brain of Morbius " ) The Three Who Rule gained immortality when they were transformed into vampire s by the King Vampire . ( TV : " State of Decay " ) The disembodied heads of the members of the Order of the Headless lived on , even when they were reduced to skull s . ( TV : " The Wedding of River Song " ) Shara created an energy converter which enabled him to transfer his life energy into a time loop in the Time Vortex , giving him eternal bliss . Jal Dor Kal lived for centuries by absorbing energy from Shara ' s relic . ( AUDIO : " Nekromanteia " ) Vilus Krull used the power of the Dark Flame to transfer his mind into different host bodies upon their deaths , allowing him to live for centuries . ( AUDIO : " The Dark Flame " ) The Mechanistrian s gained immortality by having their brain s placed in machines . ( PROSE : " Peril in Mechanistria " )