Tamsin Drew Tamsin Drew was a companion of the Eighth Doctor , until she was turned against him by the Monk and became his companion . Biography . Meeting the Doctor . Tamsin came from Dulwich and was an actress . Before she met the Doctor , her career was going badly due to her age . She answered an advertisement which read : She answered under the alias of Juliet Walsh , a strong , career - driven woman , and found herself auditioning , with Theo Lawson , Asha Qureshi and Hugh Bainbridge , for the role of the Doctor ' s new companion . " Juliet " was the first of the possible companions to be eliminated and Tamsin went home upset . She had taken the jacket of a scientist who controlled many robot s and was attacked by one . The Doctor stepped in and saved her . Asha , Theo and Hugh were all found to have malicious reasons for wanting to join the Doctor . After they were sorted out , " Juliet " revealed herself to the Doctor as Tamsin Drew and he decided to take her with him . ( AUDIO : " Situation Vacant " ) Adventures and the Monk . The Doctor and Tamsin ' s first adventure was on the devastated world of Corinth Minor . They met war criminal Morella Wendigo . ( AUDIO : " Nevermore " ) After sorting matters there , they arrived at Kells Abbey in 1006 . The Doctor was surprised to meet an old foe , the Monk , who was trying to steal the Book of Kells . ( AUDIO : " The Book of Kells " ) Leaving the Doctor . The Doctor and Tamsin arrived on Deimos Moonbase , which had become a museum containing Ice Warrior artefacts and the atmospheric re - ioniser that was part of a failed terraform ing project to create a breathable atmosphere on Mars for human s . A group of nine Ice Warriors led by Lord Slaadek — noted by one of them as " the last of our race " , though as the Doctor pointed out to him , " There [ were ] some more of you frozen out in the asteroid belt " — ( AUDIO : " Deimos " ) had been awakened prematurely by the Monk to change the course of history . ( AUDIO : " The Resurrection of Mars " ) While the Doctor went out to negotiate with the Ice Warriors , Tamsin stayed behind to make sure that the base ' s supervisor , Temperance Finch , didn ' t use the base ' s microwave emitters to kill the Ice Warriors and their hostages . However , Professor Boston Schooner had already sabotaged the controls . As Tamsin had basically confessed to Gregson Grenville that she intended to sabotage them herself , she was imprisoned . The Doctor and Gregson , realising their mistake , freed Tamsin . Tamsin helped Gregson plant mining explosives to stop the Ice Warriors . The Doctor and Tamsin boarded the rocket , but Gregson failed to make it . The rocket took off , killing Gregson and two Ice Warriors . Knowing the sabotage would eventually be reversed , the Doctor was about to use the remote device to detonate the explosives , but had received a " text message " from Lucie , ( AUDIO : " Deimos " ) whom the Monk had placed on the base as part of his plans . After falling out with the Doctor for wanting to save Lucie , but seemingly not caring about Gregson , Tamsin met the Monk , who took her in his TARDIS to show what the Doctor ' s interference would have caused . The Monk took Tamsin to the aftermath of the Ice Warriors ' attack on Halcyon around the 33rd century , convincing her that the Doctor was responsible for the billions of deaths there , and subsequently showing him apparently collaborating with the Ice Warriors in killing 600 people on a passenger rocket . Returning to the base , Tamsin met Lucie , who had been turning up the ambient temperature to slow down the Ice Warriors so that the Doctor could meddle with the re - ioniser and correct what the Monk was doing , preventing the deaths of the thousands of human colonists on Mars . When Lord Slaadek threatened the life of the Doctor , Lucie agreed to decrease the temperature again so that the Doctor would live . The Doctor , unable to reverse the effects , brought the re - ioniser " to a very sudden halt with a very loud bang " by reducing a critical feedback in the ionisation beam , giving everyone about five minutes to escape . At the last minute , the Doctor also made the process alter Mars into an Earth - like atmosphere rather than that of the Mars of long before . Tamsin told the Doctor she had " had enough " of what she considered him only looking out for his friends and the Web of Time , and condemning the fate of Halcyon in the future to the Ice Warriors and left with the Monk . The duo set off to find " some old friends who also [ had ] a score to settle with the Doctor " to " combine their talents " . ( AUDIO : " The Resurrection of Mars " ) Tamsin helped the Monk collect human artefacts on Earth while the planet was being invaded by the Dalek s and catalogued them . She had been told by the Monk that they were collecting art for humanity when it recovered , and that the Daleks were helping humanity . ( AUDIO : " Lucie Miller " ) After Tamsin learned of the Monk ' s involvement in the invasion and that he had been lying to her , she helped the Doctor try to stop the Daleks . Shortly after , the Daleks surrounded her , the Monk , and the Doctor . While the Monk was spared for aligning with the Daleks and the Doctor was considered a valuable prisoner , the Daleks disregarded Tamsin as " surplus " , and immediately exterminated her . The Monk mourned Tamsin ' s death , as he had developed strong feelings for her . Seeing this , the Doctor berated the Monk for allowing her to be the first of billions to die because of his actions in aiding the Daleks , and for not realising what he had done had guaranteed her eventual murder . ( AUDIO : " To the Death " ) Legacy . When the Eighth Doctor was about to regenerate on Karn , he remembered Tamsin among his past companions . ( TV : " The Night of the Doctor " ) The Monk was so upset by her death he tried to write the Doctor out of history in order to take revenge on him . ( AUDIO : " The Secret History " ) The Twelfth Doctor saw Tamsin , among other companions , when Bernice Summerfield was hit by temporal energy in the Pyramid Eternia . ( PROSE : " Big Bang Generation " )