Stockholm syndrome

, according to Peri, was a psychological condition characterised by "the kidnapped becoming close to the kidnapper". She suspected that Erimem's sudden decision to marry Dracula was an indication that she was perhaps suffering from the syndrome. (AUDIO: Son of the Dragon)

Colin Colchester-Price believed that the purpose of the Escape Room was Stockholm syndrome, converting people to Escape's True Faith. (AUDIO: Escape Room)

suggested that Ian Chesterton and Barbara Wright suffered from Stockholm syndrome as they bonded with the First Doctor and Susan Foreman. He realised that Ian, as a native of 1963, would be unaware of the term. (AUDIO: The Destination Wars)

Guard One and Guard Two told Constable Wolsey that they had Stockholm syndrome "in reverse" for the Sixth Doctor, having developed a liking for him during his five years' imprisonment. (AUDIO: The Widow's Assassin)

The Tenth Doctor asked his Sontaran guard if he had ever heard of Stockholm syndrome. (COMIC: The Betrothal of Sontar)

Behind the scenes
In the real world, the term "Stockholm syndrome" was coined in 1973.