Safe turns out to be a white nothingness. However, during her time in the white nothingness, Rose works out that if she'd said the words "I wish you'd never come here." then the Doctor would have never come to Rome and wouldn't have taken her to Rome, so she wouldn't have been there to make the wish, and she wouldn't be in Rome after she made the wish. So, Rose wishes that she and Vanessa were back in the temple and that they could see everything as it really is. The world reappears, and Rose sees the figure of the Doctor, who explains about the GENIEs, how they became a problem for Earth as everyone made wishes and wouldn't stop, draining all of the power sources on Earth and causing mass chaos. To save the planet, a group of people powered the earliest GENIE they could find with the sun and wished for it to reverse time to the day it was made. The GENIE burned up upon arrival in the past from using the sun's energy and its destruction destroyed all research into GENIE technology. Vanessa's GENIE survived as it was the prototype and was thus created before the other GENIES and was unaffected by the time reversal.