Jodie Whittaker as the Thirteenth Doctor, Christopher Eccleston as the Ninth Doctor, and David Tennant as the Tenth Doctor on 'Doctor Who' Credit: BBC America (3) Catching up on Doctor Who can be rather daunting, even for the biggest Whovians among us. Of the revived era (2005–present), there are a whopping 196 episodes (so far!) across 15 seasons and various specials, from Christopher Eccleston's Ninth Doctor to Ncuti Gatwa's Fifteenth Doctor.