Aside from ushering in a groundbreaking era for the show, Whittaker gave a stunning performance as the Thirteenth Doctor, meeting iconic enemies including the Daleks and the Master, giving signature speeches that would stay with the audience long after her episodes had aired, and even going the extra mile to reassure younger fans during the Covid-19 pandemic.
So now, as she celebrates her birthday, what better time to look back on 13 of Whittaker's best - or, as Thirteen would say, most brilliant - moments?
13th Doctor reveal
Before the unveiling, we saw a figure walking in a woodland, with a TARDIS key materialising in their hand.
With the simple acts of Whittaker pulling down her hood, giving a smile and walking into the TARDIS, it was made clear that Doctor Who was about to change forever.
Arriving in style
Not only did the Doctor immediately crack on with the mission at hand, in the same episode she managed to craft her own sonic screwdriver, immediately giving Whittaker's Doctor a sense of her own identity. No nonsense!
Reuniting with the TARDIS
It's not hard to imagine that the Doctor's awe in that moment matched Whittaker's own, as she and fans saw the epic new interior.
The Master reveal
As the Doctor slowly realises exactly what's happening, she displays the absolute horror that can only come with facing her age-old enemy once again.
It's a beautiful performance from both Dhawan and Whittaker - and a standout from the Thirteenth Doctor's era.
Demons of the Punjab speech
"Love, in all its forms, is the most powerful weapon we have," she says - and what's more Doctor Who than that?
The Thirteenth Doctor might have been a little awkward, and struggled to express her true feelings at times, but that made moments like this all the more special.
The Timeless Child reveal
But when that reveal happens in season 12, the best part about it is the sense of confusion, betrayal, and devastation beautifully portrayed within Whittaker's performance. Everything the Doctor thought she knew is a lie - and where does she go from here?
Meeting the Daleks
As for Whittaker's best performance in those specials? That came in Eve of the Daleks, which saw the Doctor and her companions trapped in an ever condensing time loop, with the Doctor frantically trying to avoid extermination.
Turning into a Weeping Angel
Doctor Who: Flux may have divided fans, but seeing the Doctor shaking as she rapidly turns to stone and sprouts wings is a visual we've not forgotten in a hurry.
Meeting the Fugitive Doctor
Martin immediately had us on board as she stepped into the role of the Doctor with ease - and Whittaker's expressions in that moment are absolutely priceless as Thirteen is forced to listen to someone else giving her the full Doctor spiel.
Admitting her feelings for Yaz
The Doctor's vulnerability in this moment in The Legend of the Sea Devils is utterly heartbreaking as she explains why she can't ever fully commit to a relationship with a human - and it makes their farewell even more devastating.
Message during Covid
View oEmbed on the source websiteIn the midst of the Covid-19 pandemic, showrunner Chris Chibnall put a short script together, with Whittaker popping her iconic costume on for a good cause - to give some younger fans a spot of advice if they might be worried.
With that small act, Whittaker showed what it meant to be the Doctor and the face of the show, and it meant so much to fans around the world.
Regeneration
But Whittaker's performance certainly shouldn't be overlooked. In a few lines, she embodies everything she needs to about the Thirteenth Doctor, giving us a truly emotional moment before the regeneration hits - and prompting fans to wonder at the time if she might ever return...
Return for The Reality War
Whittaker seamlessly dropped right back into the role as if she'd never been gone - and Gatwa's regeneration was all the better for it.
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