Billie Piper in the Doctor Who season finaleDoctor Who fans across the world were gagged on Saturday night when Billie Piper made an unexpected return to the franchise.After weeks of speculation about whether Ncuti Gatwa’s time as The Doctor was coming to an end in the not-too-distant future, the most recent finale saw his character regenerating, after two seasons at the helm of the Tardis.What few could have foreseen would be that his character would regenerate into what appears to be a new incarnation of The Doctor, played by Billie Piper.Billie Piper IS the new Doctor