Constance Clarke Constance Clarke was a leading WREN of the Women ' s Royal Naval Service during World War II , working at Bletchley Park in 1944 , who travelled with the Doctor in his sixth incarnation . She preferred to be addressed as " Mrs Clarke " . Biography . Early life . Constance grew up in Nyasaland , later known as Malawi . ( AUDIO : " Criss - Cross " ) She had a great - uncle named Jasper , who lived alone in an expansive manor house and spent his time talking to his dog and taking potshots at rabbit s . The Doctor reminded Constance of him . ( AUDIO : " Shield of the Jötunn " ) She returned to the United Kingdom after her father died of tuberculosis prior to 1940 . Constance attended Somerville College at the University of Oxford , where she received a first in modern languages . At a young age she married sub lieutenant Henry Clarke of the Naval Intelligence Division , who was posted to special duties in November 1943 . They were unable to have children . ( AUDIO : " Criss - Cross " , " Quicksilver " ) Solo travels with the Sixth Doctor . In 1940 , she began working at Bletchley Park . ( AUDIO : " Criss - Cross " ) While at Bletchley , she attended an escapology course but she paid little attention during it . ( AUDIO : " Absolute Power " ) In 1944 , she met the Sixth Doctor when she chastised him for overworking Sylvia Wimpole . When Major Harris came to investigate information on the Doctor , she asked him about her husband and if he was still alive . She accompanied the Doctor to Cambridge and asked Robbie Flint about her husband as well . She forced the Doctor to take her with him on his travels , wanting to be taken back to her duties once she decided to finish travelling . ( AUDIO : " Criss - Cross " ) Constance went through the Doctor ' s email in - box and found several emails for the Rani ' s parole hearing . She visited Teccaurora Penitentiary when the Rani kidnapped her . Raj Kahnu asked her why she travelled with the Doctor and then tried to have her placed in one of his suits of armour . ( AUDIO : " Planet of the Rani " ) On one travel with the Doctor , she visited the Parallel Sect where she rescued Tim Hope from being run over by a train . She suggested that they should get back to the train station when she saw the remnants of the driver ' s cabin . The Doctor left her in the train when he went with to look after the passengers . After Alice LLoyd started acting strangely , Constance left with Tim to find the Doctor . Arriving at the station , she informed the Doctor that the passengers were killing each other like it was an epidemic . The Master threatened her with his Tissue Compression Eliminator . She was delighted when the Doctor defeated the Master ' s plans . She had Tim ' s coat on which contained a Relative Dimensional Stabiliser . ( AUDIO : " The End of the Line " ) Personality . Given that she was married , when the Doctor introduced her to others as " Constance , " she was quick to correct the Doctor to a more formal " Mrs Clarke . " ( AUDIO : " The End of the Line " ) However , she allowed Lyam Yce , Florrie Solomon and Ammar Elkady to address her by her first name . ( AUDIO : " Absolute Power " ) She initially disliked it when Flip Jackson called her " Connie " but she eventually came to tolerate it . ( AUDIO : " Quicksilver " ) Behind the scenes . Constance first appeared in " The End of the Line " as an existing companion of the Sixth Doctor . Due to the release date of " " being changed from September 2015 to August 2015 , " The End of the Line " was released before the character ' s introductory story .