User summary: The D20 Doctor Who supplement provides setting details to adapt the Dr. Who television series to either "ancient to industrial eras" (D20 OGL 3.5), "modern and post-modern era" (D20 Modern) or "near and far future eras" (D20 Star Wars). The Time Lord Class presents the basic template around which the remainder of the supplement is developed. Feats, Skills, Races, Equipment, Aliens, and so forth also are provided.