Rose Tyler, played by Billie Piper, is one of the Doctor's defining companions. She met the Ninth Doctor shortly after the end of the Time War and joined him in the TARDIS. She saved the world from a Dalek invasion by absorbing vortex energy and becoming the 'Bad Wolf'. She continued to travel with the Tenth Doctor, and was eventually trapped in a parallel universe with a version of the Doctor hat was created in a meta crisis. She is shown here with the Tenth Doctor in 'The Stolen Earth'. The Doctor is roughly 10 cm tall and Rose is 9 cm.