An incarnation of the Doctor after his 11th, where he experienced a Retrocyclic regeneration in which he regressed backwards through all of his previous regenerations into the body of his first incarnation, to when he was a child about the age of 12. This incarnation was brought about by exposing the ancient Gallifreyan relic, the Holem, to the frequencies of the Time Vortex contained at its center, the Stillness. Originally refusing to answer to the name ‘Doctor’ because he had lost his memory, the Doctor’s Zhth-animated, robot companion, Zee referred to him as 11.1.