vortex. She declares that she is the "Bad Wolf", spreading the words "Bad Wolf" throughout time and space as a message to lead her there. Rose disintegrates the Dalek fleet. The Doctor begs her to relinquish her new power, but instead she resurrects Jack. Rose begins to suffer the effects of the power, and the Doctor kisses her, absorbing the entire power of the vortex into his own body to save her life. He releases it back into the TARDIS and carries an unconscious Rose back inside. They leave in the TARDIS before Jack can get back to them. As a result of absorbing the energy of the time vortex, every cell in the Doctor's body begins to die. He then regenerates into the Tenth Doctor. Production This was the first episode in this series which was not given a press screening prior to the broadcast. Radio Times stated, "No preview tape was available for this episode." The episode was, however, screened for BAFTA on 15 June 2005. According to Russell T Davies in Doctor Who Magazine, Jack was left behind because they wanted to explore the effects of the regeneration on Rose (noting that Jack would have taken the regeneration "in his stride"). Jack returned in the Doctor Who spin-off series Torchwood, which began broadcasting in October 2006. In an interview in Doctor Who Magazine, Russell T Davies stated that an alternate ending for this episode was written and filmed, with the intention that it would be shown to press previewers to hide the secret of the regeneration. The "false" ending would have featured similar dialogue to the televised final scene, but the TARDIS would have scanned Rose and the viewers would have seen the display read: "LIFEFORM DYING". Davies considered this scene inferior to the one actually shown but suggested that it might be suitable as an extra on a DVD someday. On the DVD commentary, executive producer Julie Gardner and Billie Piper briefly discuss this ending, which Gardner describes as featuring Rose's death; unlike Davies, Gardner expresses doubts that it will be issued on DVD (it was not included in the Series 1 DVD set). David Tennant's portion of the regeneration scene was actually filmed much later than Eccleston's and without the presence of Billie Piper. Tennant's segment was recorded with him speaking to a piece of sticky tape indicating Piper's eyeline and then edited into the