Book excerpt: The long-running BBC science fiction program Doctor Who has garnered an intense and extremely loyal fan base since its 1963 debut. This work examines the influences of psychology, literature, pop culture, and the social sciences on Doctor Who storylines and characters. Topics explored include how such issues as class, gender, and sexual attraction factor into the relationships between the Doctor and his companions; whether the Doctor suffers from multiple personality disorder or other psychological afflictions; and the role of the Doctor's native culture in shaping his sense of identity.