Mickey decides to stay and help stop the Cybermen around the world despite The Doctor telling him he can never return in "The Age of Steel". He and Rose become stranded on a planet orbiting around a black hole in "The Impossible Planet", where the Beast is waiting, with a Torchwood team. While there, in "The Satan Pit", the Beast taunts the Doctor and Rose about Rose's death. During the 2012 Olympic Games in "Fear Her", The Doctor picks up the Olympic flame and carries it to the end, starting the Games. The series finale takes place in contemporary London, where modern-day Torchwood is the scene for war between the evil alien Daleks and parallel-universe cyborgs the Cybermen; saving the Earth costs the Doctor Rose, who is stranded in a parallel universe, along with Mickey and her mother, in "Doomsday". In the closing scene of "Doomsday", a mysterious bride called Donna Noble (Catherine Tate) inexplicably appears in his TARDIS. The 2006 Christmas special, "The Runaway Bride" sees The Doctor and bride-to-be Donna save the Earth; Donna saves The Doctor from going too far in his revenge against the alien Racnoss, and although she declines his offer of companionship, she tells The Doctor he may need a new companion to keep him in check. In the third series (2007), The Doctor takes on Martha Jones (Freema Agyeman) as his new companion. Together, they witness the mysterious Face of Boe (Struan Rodger) prophecy to The Doctor that "you are not alone", in "Gridlock". They are rejoined by former companion Captain Jack Harkness (John Barrowman) in a three-episode adventure beginning with "Utopia", where presumed-deceased archenemy and fellow Time Lord The Master (John Simm) becomes Prime Minister of the United Kingdom and ages The Doctor. Martha's plan sees The Doctor infused with the world's psychic energies, and he easily defeats The Master, who then bribes The Doctor Into Destroying the world with a Black Hole Converter. The Master Then seemingly refuses to regenerate and dies in The Doctor's arms. Following this adventure, in the dénouement of series finale "Last of the Time Lords", Jack and Martha both depart the TARDIS, and The Doctor is shocked to see what appears to be the RMS Titanic crash into it. Set moments prior, another Children in Need mini-episode, "Time Crash", features a brief encounter between Tennant's Tenth Doctor and the Fifth Doctor (Peter Davison), containing meta-humour surrounding