Theft was the crime of taking property without permission. An individual who did so was known as a thief.
When the First Doctor stole the dimensional control from The Monk's TARDIS, the Monk was unable to get inside it, making him unable to leave 1066 England. (TV: The Time Meddler)
The theft of the dematerialisation circuit from the Master's TARDIS by the Third Doctor stranded him on Earth. (TV: Terror of the Autons)
The Fourth Doctor and Romana II became involved with the theft of the Mona Lisa by Scaroth in 1979. (TV: City of Death) Thirty years later, when the Mona Lisa reanimated in human form and made her way out of the frame, it was thought to be a theft. (TV: Mona Lisa's Revenge)
The solar system was moved and the Earth renamed Ravolox by the Time Lords to conceal the theft of information from the Matrix. (TV: The Mysterious Planet, The Ultimate Foe)
The unprecedented theft of a book from the Library of St John the Beheaded in 1887 led the Catholic Church to enlist the aid of Sherlock Holmes, who soon discovered that book was last read by the Seventh Doctor. (PROSE: All-Consuming Fire)
Lady Christina de Souza was responsible for the theft of the Cup of Athelstan from the International Gallery in London. (TV: Planet of the Dead)
The Eleventh Doctor's theft of the Home Box of the Byzantium enabled him to save River Song from dying from exposure to space. (TV: The Time of Angels)
The Teller was the ultimate anti-theft method used by the Bank of Karabraxos. (TV: Time Heist)
On 19 May 2311, the Raxacoricofallapatorians annexed the planet Tivoli, stealing it from the Stenza. The Raxacoricofallapatorians were welcomed as heroes by the native Tivolians before eventually being arrested by the Judoon, who were likewise welcomed as heroes as they placed Tivoli under their jurisdiction on 14 June 2426. (PROSE: Time Traveller's Diary)
When Tracey's belongings were stolen, all he had left were a pair of Walkman headphones. (PROSE: Hospitality)