Russell T. Davies has big plans for the future of Doctor Who, and beyond more consistency in the schedule for new episodes, he's signaled a desire to also bring some back to universe-expanding spinoffs. The BBC series has inspired several offshoot dramas in the past, though none have managed to succeed on the same level as the flagship series. Former showrunner Steven Moffat shared one possible reason as to why this may not be the best franchise for add-on shows, while still offering up what he believes is the most obvious choice for a new series.
Steven Moffat might not be showrunning Doctor Who at the moment, and hasn't in several years, but after sitting at the helm for six seasons and helping bring the spinoff Class to life, he's earned the right to speak on such matters. Fans might not wholly like what he has to say, however, at least when it comes to the general idea of creating spinoffs for the Who franchise.
