Early references The following text has been added and removed multiple times in the last few days Is there an consensus as to whether it is worthy of inclusion The Doctor s twelfth incarnation has been briefly mentioned earlier in the series In The Ultimate Foe a serial from the 23rd season The Trial of a Time Lord a mysterious figure known as the Valeyard is revealed to be a distillation of the Doctor s darker side from between his twelfth and final incarnations personally I think it is Text Me