The Doctor (The Cabinet of Light)

This incarnation of the Doctor aided Honoré Lechasseur in defeating Mestizer.

Biography
The Doctor regenerated after being shot in the back by Mestizer in the London docks. He then spent several months lying low while Honoré Lechasseur indirectly conducted his investigations for him. (TN: The Cabinet of Light)

Under the alias Dr. Smith, the Doctor tried to stop the Solidarity from existing, so that hundreds of time sensitives would not be killed by them. After failing to gain the support of the High Executioner in erasing the Solidarity from history, the Doctor departed in his TARDIS.

The Doctor then set about events in motion that meant the "Child of Time" would gain its full powers and stop the Solidarity's plans. The Doctor then left in his TARDIS with the unconcious High Executioner, who was now suffering from amnesia. The Doctor dropped the High Executioner off in 1949 where she called herself by her real name, Emily Blandish and would help the Doctor defeat Mestizer in his relative past. (THN: Child of Time)

Characteristics
The Doctor smoked to improve his singing voice and had previously lost a travelling companion, which made him reluctant to gain a new one. (TN: The Cabinet of Light)

Appearance
The Doctor had black coat with green collar, white shirt, loose collar on the coat exposing his neck, pronounced throat. He was clean shaven on only his chin and lip and had brown hair which was recedin. He was gangly but not too tall and had large hands. (TN: The Cabinet of Light)

Behind the scenes
There is a similarity between the Ninth Doctor and this incarnation of the Doctor, however such a similarity is entirely coincidental, as author Daniel O'Mahony worked on this story with no information that a new incarnation of the Doctor would be introduced just months after the publication of his novella.