Peter Capaldi flashes a broad smile as he films dramatic Doctor Who scenes with Pearl Mackie in Cardiff
Peter Capaldi was in fine spirits as he filmed scenes for series 10 of Doctor Who in Cardiff alongside Pearl Mackie.
The actor, 58, smiled brightly in between takes outside Cardiff University's main building on Thursday.
However, once in character as the extraterrestrial Time Lord, his mood changed. He wore a concerned expression as he snuck around with Pearl, 29, who plays his new companion Bill Potts.
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![Having a blast: Peter Capaldi, 58, was in fine spirits as he filmed scenes for series 10 of Doctor Who in Cardiff alongside Pearl Mackie, 29](https://i.dailymail.co.uk/i/pix/2017/01/26/15/3C891FEF00000578-0-image-a-34_1485445561990.jpg)
Having a blast: Peter Capaldi, 58, was in fine spirits as he filmed scenes for series 10 of Doctor Who in Cardiff alongside Pearl Mackie, 29
Peter's thick grey hair was wildly styled, before he put on a black coat and pulled up its fur-lined hood.
He and Pearl peeked tentatively around the corner of a building as mean-looking armed soldiers roamed nearby.
As the menacing men approached, the Doctor and Bill exchange worried glances.
![Happy: The actor smiled brightly in between takes outside Cardiff University's main building on Thursday](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C89202A00000578-4160824-image-a-47_1485447860477.jpg)
Happy: The actor smiled brightly in between takes outside Cardiff University's main building on Thursday
![In character: The Doctor looked typically smart in a buttoned-up white shirt, black waistcoat and a well-worn overcoat](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C89201200000578-4160824-image-a-48_1485447867147.jpg)
In character: The Doctor looked typically smart in a buttoned-up white shirt, black waistcoat and a well-worn overcoat
The actress kept well wrapped up, covering her ears with furry muffs and sporting a thick winter coat.
Pearl - best known for her role in The Curious Incident of the Dog in the Night Time - was announced as the Doctor's new sidekick during an FA Cup semi-final match, with a special teaser trailer showing her and the Time Lord facing off against a Dalek.
She certainly has a fan in her co-star Capaldi, who recently said: 'It is a genuine delight to welcome Pearl Mackie to Doctor Who.
![He means business: The Doctor looked to have a plan as he gazed into the distance with intent](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C8927A200000578-4160824-image-a-49_1485447881714.jpg)
He means business: The Doctor looked to have a plan as he gazed into the distance with intent
![Stealthy: Peter and Pearl peeked tentatively around the corner of a building as mean-looking armed soldiers roamed nearby](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C89231F00000578-4160824-image-a-50_1485447889905.jpg)
Stealthy: Peter and Pearl peeked tentatively around the corner of a building as mean-looking armed soldiers roamed nearby
![Battling the cold: Pearl kept well wrapped up, covering her ears with furry muffs and sporting a thick winter coat](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C8922F300000578-4160824-image-a-51_1485447897715.jpg)
Battling the cold: Pearl kept well wrapped up, covering her ears with furry muffs and sporting a thick winter coat
'A fine, fine actress with a wonderful zest and charm, she's a refreshing addition to the TARDIS and will bring a universe of exciting new possibilities to The Doctor's adventures.'
The show is reportedly set to return to screens in April and will see Matt Lucas return as Nardole, while David Suchet will make a guest appearance as The Landlord.
Little Britain star Lucas previously said in a BBC press release: 'I’m chuffed to bits that Nardole is returning to the TARDIS for some more adventures. I loved acting with Peter and I’m excited to work with Pearl.'
While executive producer Steven Moffat added: 'Delighted and slightly amazed to be welcoming Matt Lucas back on to the TARDIS - and this time it’s not just for Christmas, he’s sticking around. One of the greatest comedy talents on planet Earth is being unleashed on all of time and space.'
![Intimidating: The soldiers wore heavy-duty armour and carried machine guns](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C8924DD00000578-4160824-image-a-52_1485447911653.jpg)
Intimidating: The soldiers wore heavy-duty armour and carried machine guns
![You shall not pass: One soldier formed a barrier with his arms](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C8924C900000578-4160824-image-a-53_1485447917122.jpg)
You shall not pass: One soldier formed a barrier with his arms
![Menacing: One soldier produced a stern look behind his mask](https://i.dailymail.co.uk/i/pix/2017/01/26/16/3C8923F300000578-4160824-image-a-54_1485447922906.jpg)
Menacing: One soldier produced a stern look behind his mask
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