Fans were astonished earlier this year as they sat down to watch Steven Moffat's latest episode of Doctor Who, Boom, as they noticed the already announced new companion star for season 15, Varada Sethu, popping up ahead of time as the character Mundy Flynn.

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It was later confirmed that Sethu's companion role would be a different character to Mundy, and Moffat teased that "there is a plan" going forward, adding: "That’s all I’m telling."

Fans instantly started theorising as to what that plan could be, but now Davies has confirmed that any in-story explanation as to Sethu's dual roles was added after the fact, as her casting was actually more in line with that of previous companion star Freema Agyeman.

Agyeman famously played Tenth Doctor companion Martha Jones, but before her casting in that role she appeared as the one-off character Adeola in Army of Ghosts.

Davies and the team saw her performance, loved working with her, and decided to cast her again.

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Speaking with SFX magazine, Davies explained that there was a similar situation with Sethu, saying: "I think we might as well just be simple with this, because we’ve already said she’s not coming back as Mundy Flynn.

"It’s one of those very simple situations, like with Freema [Agyeman, who appeared in Army Of Ghosts before being cast as Martha Jones]: when you cast a great actor, you need a new companion.

"I was watching, like, the 15th edit of Boom, loving her. Every time I watch her, I think, 'God, she’s brilliant.' I literally think she’s brilliant. I used to watch her thinking, 'God, what a shame we can’t work with her again.'"

Freema Agyeman as Adeola in Doctor Who: Army of Ghosts smiling with an earpiece in
Freema Agyeman as Adeola in Doctor Who: Army of Ghosts. BBC

Davies continued: "I was thinking, 'Should we go back to the 51st century, could we meet her again?' and then I suddenly went, 'Oh, let’s just cast her again. We’ve done that before. Lovely.' The relief that went around the entire production and the BBC, everyone went, 'Oh, great.' It was the most instant 'yes' you’ve ever seen.

"So, she didn’t even have to audition. We then invited her to come in for a meeting, but she thought she was coming in to audition [laughs] and it was the other way round. It’s like we were auditioning. We were wanting her to like us so much that she’d want to come back!

"We had a great meeting. She was kind of amazed and delighted. Lovely. Good stuff ahead. Completely new character, again, a completely new story, and that’s a great new story that will run across eight episodes."

When Sethu's casting as the new companion was officially confirmed, she said in a statement: "I feel like the luckiest person in the world.

"It is such an honour to be a part of the Whoniverse, and I'm so grateful to the whole Doctor Who family – because that is what they are – for welcoming me with open arms and making me feel so at home.

"I couldn't ask for a better team than Ncuti [Gatwa] and Millie [Gibson] to be on this adventure with, this is SO much fun!"

Ncuti Gatwa on the cover of the SFX magazine. His arms are folded with two people stood next to him reaching out.
The latest cover of SFX magazine.

The latest issue of SFX Magazine is out now. Doctor Who is available to stream on BBC iPlayer.

Doctor Who will return at Christmas on BBC iPlayer and BBC One. Previous seasons are available to stream on BBC iPlayer with episodes of the classic series also available on BritBox – you can sign up for a 7-day free trial here.

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