Beginning with the first episode of Doctor Who, An Unearthly Child, the documentary charts the history of the show, analysing the style of the various eras and incarnations of the Doctor. The documentary also shows the opinions of several interviewees about the show. Verity Lambert describes it as "part of growing up", several say whether they believed if Doctor Who should come back, and Tom Baker admits that "the BBC keeps sending me copies of the compilations, and I never look at them".