Emergency Program One

Emergency Program One was a feature of the Doctor's TARDIS designed to return a companion to a designated place in case of extreme emergency. (TV: The Parting of the Ways)

The Tenth Doctor mentioned that Emergency Program One was automatically activated after five hours. (TV: Silence in the Library) When activated, it projected a hologram recording which explained the program. (TV: The Parting of the Ways)

The program was tripped by the Tenth Doctor when he tried to get Majenta Pryce to Panacea. It was then co-opted by Finn Dargo, who used it as a way to effect an arrest on the TARDIS' inhabitants. (COMIC: The Crimson Hand)

Believing that he would die on the Game Station, the Ninth Doctor used it to play a message for the benefit of Rose Tyler before the TARDIS returned Rose to the Powell Estate in 2006. (TV: The Parting of the Ways)

Donna Noble recorded a message on it as a way to say goodbye to the Tenth Doctor, in the event that she might not have a chance to do so herself. (COMIC: The Time of My Life)

Security Protocol 712 seemed to use the same holotechnology as Emergency Program One. (TV: Blink)

It is possible that this was the program used by the Eleventh Doctor to return Clara Oswald home twice during their second visit to Trenzalore. However on these occasions, no recorded message was used. (TV: The Time of the Doctor)