 The Master orders the Toclafane to kill US President Winters.The Master reveals that he can see around the perception filters, and uses his laser screwdriver to kill Jack and artificially age the Doctor 100 years using Professor Lazarus's genetic manipulation technology and DNA he took from the Doctor's severed hand (which Jack took aboard the TARDIS).Jack, having been revived, gives Martha his vortex manipulator and tells Martha to get off the "Valiant".