Timeless Child

The Timeless Child was a title used to refer to the mysterious being from whom, across several regenerations, the First Tecteun extracted the secret of regeneration. According to the Spy Master, the Timeless Child's incarnations were none other than the original incarnations of the Doctor, long before the First Doctor.

History
According to the Spy Master, the Founding Fathers of Gallifrey built Time Lord society on a lie regarding the Timeless Child. This was buried deep within all Time Lords, in the form of repressed thoughts and memories: hidden, but integral to their identities. (TV: Spyfall) He later expanded upon this stating that an individual known as the "Timeless Child" was discovered and whose ability to regenerate was written into the genetic code of Time Lords. This history was subsequently hidden, with another explanation, a lie, being given for this ability instead. (TV: The Timeless Children)

While taunting the Thirteenth Doctor about her fears, Remnants on the planet Desolation looked "further back" into her past and referred to the Timeless Child.

When they made the reference, the Doctor was confused and asked them what they were talking about, then angrily told the Remnants to "get out of [her] head". (TV: The Ghost Monument)

Once the Master learned the truth about the Timeless Child, he ravaged Gallifrey to "make them pay" for what he discovered. He told the Thirteenth Doctor that learning the truth had not been easy for him. (TV: Spyfall)

The Timeless Child was eventually revealed by the Master to be a child discovered on another planet who had the power to regenerate, and had come through a gateway from another universe or dimension. The child was adopted by the First Tecteun, who discovered her power to regenerate after she suffered a fatal fall from a cliff, leading to Tecteun studying the child's power for a number of years and regenerations. Tecteun was eventually able to replicate the regenerative ability for herself and eventually spread it to the other Time Lords, though they limited their number of regenerations to twelve. In the process, the Timeless Child became the genetic template upon which all Time Lords gained their regenerative powers, in effect meaning that a piece of the child is in each Time Lord.

Tecteun and the child were inducted into a clandestine organisation called the Division, led by a Time Lord called Solpado, whose job it was to intervene in time when necessary. After being tested, the results came back saying they were the best the Divison have ever seen.

The Master revealed to the Doctor that the Timeless Child was in fact the Doctor themselves who apparently had her memories redacted. This was the Master's reason for why he ravaged Gallifrey, anger in the fact that every Time Lord, including him, had a piece of the Doctor in them. In addition, large portions of the Matrix on Gallifrey pertaining to the life of the Timeless Child were also redacted beyond even the Master's ability to recover it. However, Tecteun hid some of the truth in the Matrix in the form of the story of Brendan, an immortal Irish policeman. The Master suggested that this was an attempt by Tecteun to apologize or possibly a gift meant to help her child one day decode the truth of their existence. (TV: The Timeless Children)

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