Doctor Who SPOILER: Neil Patrick Harris is pictured on set for the first time

Neil Patrick Harris has been seen filming Doctor Who’s 60th Anniversary for the first time after joining the cast as a mystery villain.

The It’s A Sin star, whose casting was announced on Monday, joined David Tennant to film explosive scenes which saw the streets of Bristol littered with alien debris.

Returning Who showrunner Russell T Davies confirmed earlier this week that Neil that Neil is set to join the cast as a new villain, who will face The Doctor in the Anniversary scenes which will air next year.

Here he is! Neil Patrick Harris has been seen filming Doctor Who’s 60th Anniversary for the first time after joining the cast as a mystery villain

Offering a new twist on his character’s famous look, David sported a brown tarten suit and a blue trench coat as he dashed along the street during the explosive scene.

Sporting The Doctor’s famous trainers, the Broadchurch star looked visibly shocked during the dramatic scenes as he witnessed the fallout of an explosion.

While one alley was completely littered with standard rubble, another was filled with more mysterious debris, hinting that a sinister alien invasion could be looming.

Dramatic: He joined returning David Tennant, who is reprising his role as the iconic Tenth Doctor

Dramatic: He joined returning David Tennant, who is reprising his role as the iconic Tenth Doctor

He's back! Donning his signature suit and trench coat, the actor once again transformed into the beloved Time Lord to film an explosive scene in Bristol

He’s back! Donning his signature suit and trench coat, the actor once again transformed into the beloved Time Lord to film an explosive scene in Bristol

Slipping back into it! Nine years after last playing The Doctor, David once again slipped back into the role

Arriving: He was seen filming for the anniversary, which will air in 2023

Slipping back into it! Nine years after last playing The Doctor, David once again slipped back into the role to film scenes for the anniversary, which will air in 2023

Transformation: Offering a new twist on his character's famous look, David sported a brown tarten suit and a blue trench coat as he dashed along the street during the explosive scene

Transformation: Offering a new twist on his character’s famous look, David sported a brown tarten suit and a blue trench coat as he dashed along the street during the explosive scene

What's going on? Sporting The Doctor's famous trainers, the Broadchurch star looked visibly shocked during the dramatic scenes as he witnessed the fallout of an explosion

What’s going on? Sporting The Doctor’s famous trainers, the Broadchurch star looked visibly shocked during the dramatic scenes as he witnessed the fallout of an explosion

What's happened? David cut a concerned figure as he got back into character to film more scenes for the anniversary, building anticipation among fans

What’s happened? David cut a concerned figure as he got back into character to film more scenes for the anniversary, building anticipation among fans

Viewers could be set to witness Planet Earth at the centre of another apocalyptic disaster, as one extra was stood on a podium brandishing the sign: ‘The End Is Nigh.’

While much of the street was kept in the present day, a mysterious toy shop had also been erected, and a peek into the window showed an array of wooden toys, board games and a cuddly bear.

Despite it being nine years since he last played the role for Who’s 50th Anniversary, David slipped back into the part like a glove as he filmed the solo scenes.

Alone: Despite it being nine years since he last played the role for Who's 50th Anniversary, David slipped back into the part like a glove as he filmed the solo scenes

Alone: Despite it being nine years since he last played the role for Who’s 50th Anniversary, David slipped back into the part like a glove as he filmed the solo scenes

New look: He looks set to sport a new twist on his character's famous look

Iconic: His outfit included a suit, Converse trainers and a trench coat

New look: He looks set to sport a new twist on his character’s famous look of a suit, Converse trainers and a trench coat

We are doomed! Viewers could be set to witness Planet Earth at the centre of another apocalyptic disaster, as one extra brandished the sign: 'The End Is Nigh'

We are doomed! Viewers could be set to witness Planet Earth at the centre of another apocalyptic disaster, as one extra brandished the sign: ‘The End Is Nigh’

Catherine Tate, who is set to reprise her role as the Doctor’s companion Donna Noble, was not present on the set, after the pair were seen filming together in Cardiff last week.

It comes just a day after Who bosses announced that It’s A Sin star Neil has joined the cast to play the ‘greatest enemy the Doctor has ever faced’ and is filming scenes set to air next year.

It remains unclear whether Neil will appear alongside returning Time Lord David Tennant or the new Doctor, which is set to be played by Ncuti Gatwa.

Following the BBC’s announcement, Russell wrote on Instagram: ‘Neil Patrick Harris, welcome to Cardiff! Playing the greatest enemy the Doctor has ever faced.  

‘Such a great actor, such a great man, it’s an honour and a hoot. Have fun! @nph @bbcdoctorwho Ha!’

Neil added on his page: ‘My current gig. Never looked more dashing. Thank you for inviting me into your Whoniverse, @russelltdavies63. 

‘I’ll try my hardest to do my worst. This Doctor has no idea what’s in store. And even if he does… Who cares? Ha ha ha HA ha-ha-ha!’

Neil also joins newcomer Yasmin Finney, who is to take on the role of Rose. Yasmin recently gained recognition for her role of Elle Argent in Netflix hit Heartstopper.

The new cast are filming scenes that are due to air in 2023 as part of the show’s 60th anniversary.

The name of Neil’s character, and any further details about his new role, are yet to be confirmed.

Speaking about the sci-fi show’s new arrival, Russell said: ‘It’s my huge honour to open our studio doors for the mighty Neil Patrick Harris… but who, why, what is he playing?

‘You’ll just have to wait. But I promise you, the stuff we’re shooting now is off the scale. Doctor beware!’

Queer As Folk and It’s A Sin writer Russell is returning as the programme’s showrunner after departing in 2009.

Russell, who was responsible for Doctor Who’s revival in 2005, will be back to celebrate the show’s 60th anniversary in 2023, the BBC previously said.

He worked with Neil on hit Channel 4 mini-drama It’s A Sin, in which the American star portrayed Savile Row tailor Henry Coltrane.

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