Doctor Who show, as the story begins anew with each companion and she undergoes more change than the Doctor. The primary companions of the Ninth and Tenth Doctors were Rose Tyler (Billie Piper), Martha Jones (Freema Agyeman), and Donna Noble (Catherine Tate) with Mickey Smith (Noel Clarke) and Jack Harkness (John Barrowman) recurring as secondary companion figures. The Eleventh Doctor became the first to travel with a married couple, Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill), whilst out-of-sync meetings with River Song (Alex Kingston) and Clara Oswald (Jenna Coleman) provided ongoing story arcs. The tenth series introduced Pearl Mackie as
Harry Sullivan (Doctor Who) but he is apparently on some secret assignment and neither has seen him for a long time. Will is eventually revealed to be a sleeper agent of a religious cult targeting Sarah Jane, and dies during the course of the series. Harry appears in the Titan "Doctor Who" Ninth Doctor comic storyline "Official Secrets", set in the 1970s, where he briefly takes command of UNIT during the Brigadier's absence while investigating the mysterious appearance of large monsters, meeting the Ninth Doctor, Rose Tyler and Captain Jack Harkness during the crisis. A vision of Harry is seen along with every other