The surprise reveal happened in this week's brand new episode!

'Doctor Who' Makes History With Jo Martin As Show's First Black "Doctor"

Jodie Whittaker, Chris Chibnall, Maude Garrett, Matt Strevens

Doctor Who has officially introduced a second female Doctor into the fold... and for the first time ever, she's played by a black woman!

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Doctor Who has certainly got fans across the globe abuzz regarding the show's introduction of a new character, and with good reason! In yesterday's episode of the hit British sci-fi series, "Fugitive of the Judoon", actress Jo Martin first appeared to play a tour guide named "Ruth Clayton".

However, it was revealed later on in the episode that Martin's character was actually another incarnation of the Time Lord known as "The Doctor"! While live-tweeting the show, the show's Twitter account confirmed the casting:

The newest "Doctor" - who is Jo Martin?

Over the span of Doctor Who's 56-year history, "The Doctor" has had many different appearances, seeing the alien time traveller "regenerate" into a new likeness with every actor to play them. The role is currently filled by Jodie Whittaker, who was the first woman cast as "The Doctor", and is now into her second season of the show.

However, the addition of Martin as a former "Doctor" certainly proves to be an interesting one, adding a richer, more diverse history to the character by revealing this incarnation of them exists.

A quick look at Jo Martin's IMDB page shows that she's been in the acting industry for years, having an extensive list of credited minor roles in a wide-ranging variety of movies and television shows. Could her new gig as "The Doctor" in Doctor Who be her breakthrough role?

Martin certainly seems enthused to play the character, even changing her Twitter profile picture after the episode aired to a photo of her in costume as "The Doctor":

Doctor Who's decision to incorporate a black female doctor into the show's universe has been generally well-received by fans of the show, as they've taken to the internet to express their excitement about the diversity and representation it creates.