PERSONALITY

TBA

BIOGRAPHY

Born on Gallifrey, Ailla grew up in the House of Jurisprudence. When she looked into the Untempered Schism, she was inspired by what she saw, taking up a career in eventually joining the Celestial Intervention Agency.

Ailla disguised herself as a human from the 28th century and became Koschei's companion.

She befriended Victoria Waterfield, and took her to Koschei's TARDIS.

Ailla was shot on Darkheart and regenerated while recovering in the Zero Room of Koschei's TARDIS. Koschei, still assuming she was human, thought she was dead and destroyed an entire planet to try to learn how to use the Darkheart to manipulate time to explicitly change history. When she reappeared, it proved to be too much for him. Her betrayal was believed to have been the catalyst for turning Koschei into the Master, who sought to control the universe. After the Doctor stopped him, she tried to arrest the Doctor, saying the Time Lords wanted the Doctor's TARDIS and himself to return to Gallifrey but was held up until the Doctor and his companions could escape. 

Not long after this, Ailla manages to return back to Gallifrey and meet up with her mentor, Goth, who eventually becomes a pawn of the Master himself, trying to help him steal the Fourth Doctor's remaining regenerations. Ailla manages to stumble upon the hidden and dark truths concerning the CIA and all they have put the Master through (especially being the reason for causing his madness by the Drums.) 

Filled with guilt over her role concerning Koschei, leading him down a dark path and feeling crushed over realizing how the CIA isn't what she thought it was, Ailla leaves Gallifrey long before the Time War happens and spends her time on Earth, hiding in plain sight, before landing a job at UNIT in the modern era. 

TRIVIA

• In her first incarnation, Ailla was a tall, young woman who wore a blouse with slacks and knee-length boots. She had bright and inquisitive eyes above smooth cheeks and shortish dark hair sculpted into curls.

• In her second incarnation, she was a woman with expressive eyes above high cheekbones, and shoulder-length auburn hair that was parted in the centre. 

• In David A. McIntee's From the Cutting Room Floor, published in the charity publication Perfect Timing, he listed a number of scenes cut from the published version of the Missing Adventure The Dark Path. One of them involved Ailla and Koschei fighting a Sontaran squad where she allowed herself to be caught extracting data from the ship's computer, but was in fact installing a computer virus, saving a planet from invasion. The second one involved Victoria realising Ailla was in love with Koschei, but Ailla pointed out there are different kinds of love and the kind she had for Koschei wasn't sexual. She cared for him and wanted to be with him at all times.