DOCTOR Who made waves last month when Jo Martin made her debut as the first ever black, female Doctor.

The actress, who starred in the likes of Top Boy and Holby City, was hidden in Gloucester under the false identity of tour guide Ruth Clayton.

5 Jo Martin was introduced as another iteration of The Doctor last month Credit: BBC One

However, by the end of the episode her amnesia lifted and she was reunited with her very own Tardis.

The timeline between Jo and current Doctor Jodie Whittaker remains shrouded in mystery as the pair failed to remember each other, however we did get some key insights.

Jo claims her Doctor came to be before the sonic screwdriver, which places her as one of the very first iterations of the Time Lord.

Well, a scene from season 9, episode 1 The Magician’s Apprentice appears to confirm that Jo was in fact the very first Doctor.

5 Missy and Clara Oswald discussed The Doctors past back in season 9

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Missy was played by Michelle Gomez

During a tense exchange between Missy (Michelle Gomez) and then-companion Clara Oswald (Jenna Coleman), the pair get onto the topic of The Doctor’s early years.

As fans will know, The Master, or in this instance, Mistress, and the Doctor go way back, all the way to their Gallifreyan childhoods.

Signalling to Peter Capaldi’s iteration of The Doctor, Missy quips: "I knew him when he was a little girl."

This must mean that Jo’s form was the one The Doctor grew up as, marking her as the first ever Doctor, which fits in with her comments about existing before the sonic screwdriver.

With this in mind, Doctor Who gave away one of its biggest twists to date a whopping five years ago.

5 Peter Capaldi played the Doctor back in 2015 Credit: BBC

5 Jo and Jodie failed to recognise each other Credit: BBC One

The only slight discrepancy with this is the fact that Jodie Whittaker didn’t immediately recognise her old self.

However, she admitted at the end of the episode that time had been disrupted and was swirling around her.

Considering Jo also battled memory loss in the episode, perhaps Jodie’s amnesia is a similar symptom from some kind of wider temporal shift.

Jo’s casting initially divided opinion, with some celebrating the show’s inclusiveness and diversity, while others claimed the BBC was acting out of political correctness by having two concurrent female Doctors.

Doctor Who continues on BBC One on Sunday at 7:10pm.