google.com, pub-ca-pub-6067120031842370, DIRECT, f08c47fec0942fa0 Centenary Special As fans look forward, they know a new era is coming. But Jodie and Chris Chibnall have one last episode. The centenary special to celebrate sixty years of Doctor Who. Everyone knows they will see the return of Ace and Tegan, but will they see classic Doctors as well? The idea isn’t bad. Multiple Doctor shows do happen. They usually occur to celebrate special events. Classic fans remember The Three Doctors, The Five Doctors, and…