A name bestowed on the Young Doctor by his Zhth-animated, robot companion, Zee, when he refused to answer to the name ‘Doctor’ just after his Retrocyclic regeneration. It indicates the number of his current regeneration; the .1 referencing the fact that this regeneration was not a full regeneration creating a new incarnation, but rather a regression of his body back to its first incarnation, halted at about age 12. (See also Young Doctor).