Shoe Shoes were a common item of clothing worn by humanoid species as fashion and to cover or protect their feet . Their presence was so usual in most cultures encountered that it was rare that they would be noticed specifically . The Doctor and most of his companion s wore shoes on most occasions , as it made his main bit of advice — " Run ! " — a bit easier on their feet . Susan Foreman lost one of her shoes on Marinus when it fell into a pool of acid and dissolved . ( TV : " The Keys of Marinus " ) When the newly regenerated Third Doctor was found unconscious by UNIT soldiers , he was taken to the hospital . The hospital nurse , who was already concerned about his unusual vital signs and diagnostic test results , found him leaning out of bed , muttering about shoes . She put him back to bed and he appeared to fall asleep . When he later got to his shoes , the TARDIS key was hidden in one . ( TV : " Spearhead from Space " ) After his own regeneration , the Fourth Doctor searched his person for his TARDIS key before remembering it was in his shoe . ( TV : " Robot " ) Grace Holloway gave the Eighth Doctor a pair of shoes which originally belonged to her ex - boyfriend Brian . After wearing them for a while , the Doctor claimed they " fit perfectly " . ( TV : " Doctor Who " ) While the Tenth Doctor was trapped on the Moon with Martha Jones in the Royal Hope Hospital , he used the sonic screwdriver to multiply the output of an X - ray machine to use it as a weapon to stop the Slab that was chasing him . When Martha questioned him about the dose of radiation , the Doctor told her roentgen radiation wasn ' t dangerous to him . He squirmed around , saying he was concentrating to expel it into one of his shoes , then threw the shoe in the trash . When Martha called him mad , he said , " You ' re right . I ' d look daft with one shoe , " and threw the other in the trash to go barefoot . ( TV : " Smith and Jones " ) River Song walked on Alfava Metraxis with her red high heel shoes in her hand when she signalled Father Octavian at the crash of the Byzantium . ( TV : " The Time of Angels " ) An identical pair of shoes were present in the UNIT Black Archive . ( TV : " The Day of the Doctor " ) The Tenth Doctor wore trainers on his travels , the colour of which he varied from adventure to adventure . When he met his War and eleventh incarnations , the latter kept calling them sandshoes ; when the Tenth Doctor insisted that they weren ' t , the War Doctor responded by saying , " Yes , they are . " ( TV : " The Day of the Doctor " ) The Tenth Doctor complimented Martha Jones on the shoes she wore to the party commemorating the unveiling of Richard Lazarus hypersonic soundwave manipulator . ( TV : " The Lazarus Experiment " ) When the Eleventh Doctor went to St John ' s Monastery in the 22nd century to meet the early version of the Flesh , he stepped in some of the acid that they were mining . He removed his shoes and then borrowed another pair from the miners . When the Eleventh Doctor Ganger arrived , then stabilised , they encouraged the others to use the shoes to tell them apart , then switched shoes so that the Doctor and his Ganger could assess Amy . ( TV : " The Rebel Flesh " , " The Almost People " ) In the year 200 , 100 on " The Weakest Link " , Rose Tyler was asked in what area of fashion Stella Bopbates was famous in . She incorrectly guessed shoes ; the correct answer was hats . ( TV : " Bad Wolf " )