Mr Mystery

Mr Mystery was a reader of the website Doctor Who?.

Biography
Following the Dummy Massacre of 2005, in which Rose Tyler left Earth to travel in the TARDIS with the Ninth Doctor, (TV: Rose) Mr Mystery responded to Doctor Who?'s request for sightings of Rose, saying only that he had seen Rose before, but could not say where or when, for he was Mr Mystery. (PROSE: The Doctor Was Involved in the Dummy Massacre)