The Doctor's primary companion in the first series of the 2005 revival. Plucked from obscurity on Earth, she travels in the TARDIS, becomes central to the 'Bad Wolf' story arc, and develops a strong bond with the Doctor.
The season culminates in a deeply emotional separation, underscoring a bond that transcends mere friendship or alliance.
Unspoken longing and sacrifice define their brief S4 reunion before final separation.
Both serve as moral compasses for the Doctor in their respective seasons.
Explore the full interactive character relationship map of Doctor Who