Last of the Time Lords
In the "Torchwood" episode "End of Days", the hand glows when the TARDIS is heard materialising in Cardiff. Alerted by the hand, Jack finds the Doctor in "Utopia", and he describes the hand as a "Doctor detector"; at the end of the episode, the hand is stolen by the Master along with the Doctor's TARDIS. In "The Sound of Drums", the Master reveals he has used the hand to derive the Doctor's biological code, with which he accelerates the Doctor's ageing by one hundred years using his laser screwdriver. After the events of "Last of the Time Lords", the Doctor recovers the hand.