Doctor Who's casting director Andy Pryor is already praising the "fresh" chemistry between Peter Capaldi and new companion Pearl Mackie.
The actress was unveiled as The Doctor's latest time-travelling companion Bill last week in a short film that had the two dodging Daleks.
Chatting with RTS, Andy Pryor revealed that stage veteran Mackie won the coveted job over 50 other actors.
"There was a chemistry that felt fresh and new and different to Peter's relationship with Jenna [Coleman]," Pryor said.
"You could see Peter [Capaldi] fizzing with ideas in that audition reading and in the clip that was ultimately produced with the announcement."
Pryor continued: "What people saw in the announcement [short film] was one of the audition scenes originally.
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"I think Pearl grabbed those scenes and did something really exciting with them."
While Pearl is a veteran stage performer, Doctor Who will actually be her first major television role.
"She's a great example of somebody who proves that you don't always have to have experience to be good," Andy explained. "She's a very experienced theatre actor and has done quite a variety of theatre work. She's not naïve and she's not a pushover.
"She's one of those people that has a natural ability on camera."
Following BBC One's reveal, Pearl vowed to bring "a bit of attitude into the TARDIS".
Doctor Who series 10 news, rumours, cast, airdate and everything you need to know
Doctor Who series ten debuts next year following a standalone Christmas special and will also be the last with Steven Moffat as showrunner - he hands over the controls of the TARDIS to Broadchurch's Chris Chibnall in 2018.
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