The Past Doctor Adventures (PDA) was a series of paperback novel launched by BBC Books in 1997 in conjunction with its Eighth Doctor Adventures line. This series featured new adventures of the first seven Doctors, with the exception of three releases (see note below). Both series ended in 2005 when BBC Books decided to focus its publishing ventures on books related to the revived TV series. Although there was speculation that the PDA line would later resume with novels featuring the Eighth Doctor and even Ninth Doctor, as of 2009 this has not eventuated.