Possessing alien physiology, the Doctor, when critically injured, can regenerate into a new body, gaining a new physical appearance and personality.

This plot device has allowed a number of actors, both male and female, to portray the Doctor through the decades.

[5] Lee, a fellow Time Lord and fugitive, directs Ruth to a lighthouse, where her previous identity is restored.

As they reveal their identities to one another, it transpires that neither Doctor recognises the other, leading to confusion between the pair as they both assumed the other was a future version of themselves.

After tricking Gat into accidentally killing herself with a malfunctioning gun, the Fugitive Doctor parts with her other self acrimoniously.

[17] In that episode, the Thirteenth Doctor has been cast back into her past timestream to her previous visit to the Temple of Atropos, where she last confronted the Ravagers known as Swarm and Azure.

[18] Unlike all other incarnations of the character, Martin's Doctor will readily make use of available weaponry to decisively end conflict.

A dark-coloured Scottish tweed waistcoat and frock coat, with a period cut after the classic Doctors, add to the suggestion of a fiercer incarnation.

[21] A brightly coloured shirt with a stand collar and frilled cuffs provide a contrast to hint at the Doctor's eccentricity[15] and were made from African Kente cloth as a tribute to the actor's heritage and the significance of her casting.

[12] Martin's performance as the Fugitive Doctor has been lauded by critics,[2][24] with some expressing their desire to see more of the character on screen.

[27] Bleeding Cool's Adi Tantimedh felt Chibnall had "robbed Jo Martin and the show of the fanfare of the first woman of colour to play The Doctor, reducing it to a throwaway gag".