Billie Piper

Trapped by Autons in the basement of Henrik's department store, shop assistant Rose Tyler’s life is saved by a chance encounter with the Doctor. When her heroism leads to the defeat of the Nestene, he invites her to travel with him – taking her from Victorian Cardiff to the day the Earth died. And although travelling with the Doctor was often dangerous, she told him she’d stay with him forever. Witnessing the Ninth Doctor’s regeneration only made that bond stronger. However, during the Battle of Canary Wharf they were separated – trapped on parallel worlds. Using a Dimension Cannon she attempted to make contact with the Doctor (and new companion Donna) several times, eventually encountering him as he was exterminated by a Dalek. Once healed and the Daleks defeated, he returned Rose to the parallel world with her family and the half-human version of himself, to live the rest of their lives together.