Fourth Timeless Child

The Timeless Child was an alias used to refer to incarnations of the Doctor before the First Doctor.

History
According to, 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. When the Master first mentioned the Timeless Child mystery to the Doctor, she got a massive headache and a flashback to when the Remnants approached her, as well as a glimpse of a child wearing yellow robes and standing outside a tall building under a purple sky. (TV: Spyfall)

While aboard a space platform in the far future owned by Zellin, the Doctor, after having fallen unconscious due to Zellin's powers, dreamed about the vision of the Timeless Child while the Master's message to her echoed in her mind. In this scenario she was actively present in the vision. (TV: Can You Hear Me?)

The Timeless Child was eventually revealed by the Master to be a child discovered on another planet who had the power to regenerate infinitely who had come through a gateway from another universe or dimension. The child was adopted by 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.

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)

First incarnation
She looked like a young dark-skinned girl with brown eyes and short black curly hair.

She wore a reflective scales-patterned ray robe with a brown sash. Over it she wore an open gown of similar pattern with wide cuffs, square button and safran yellow back fabric. (TV: The Timeless Children)

Second incarnation
She looked like a young seemingly East Asian girl with long straight black hair and brown eyes.

She wore the same garments as her immediate predecessor. (TV: The Timeless Children)

Third incarnation
She looked like a young fair-skinned girl with blonde hair of shoulder length braided style.

She wore black leggings and a pale green robe with dark green sash and high collar. (TV: The Timeless Children)

Fourth incarnation
He looked like a young apparently Chinese boy with short black hair covering his forehead and black eyes.

He wore black leggings and a pale green robe with dark green sash and high collar. (TV: The Timeless Children)

Fifth incarnation
He looked like a young fair-skinned boy with brown short hair covering his forehead.

He wore black leggings and a grey-blue robe with white sash and high collar. (TV: The Timeless Children)

Sixth incarnation
She looked like a young girl with brown styled hair.

She wore black leggings and a grey-blue robe with white sash and high collar. (TV: The Timeless Children)

Seventh incarnation
He looked like a teen dark skinned male with black hair styled into a short hi-top.

He wore a black leggings and a grey-blue robe with white sash and high collar. Later he changed it for a cream dress with high collar and a scarlet gown with high collar over it. (TV: The Timeless Children)

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