Producer David Richardson said: "The Rani is back at last... and it's about time. Rochana has written a stunning script which reunites two of Gallifrey's most renowned runaways, and they are front and centre in almost every scene of a story that explores the history and dynamic of their relationship."

Writer Rochana Patel added: "It's been over ten years since the Rani's last Big Finish appearance, so a rematch is long overdue... Where's she been? What's she been doing? As the universe burns, where does the exiled Rani stand in the war between the Time Lords and the Daleks? All these questions will be answered... And, in these dark and terrible days, are the Rani and the War Doctor enemies...? Or something else...?

"“For this epic three-part story, I wanted to completely re-examine the Rani as a character, revisit that apathetic scientist that we first encountered in Mark of the Rani, her backstory with the Doctor, and explore what makes her into the woman who re-emerges in Wish World and The Reality War. This is very much the missing piece of the Rani's story... And, perhaps, the Doctor's too..."

Script editor Matt Fitton said: "The Rani is such an interesting and different kind of Time Lord villain. She's not out to take over the universe, but more to steer it. In the Time War, she's taken a look at everything, evaluated all the evidence, and realised it's kind of unwinnable for the Time Lords. And based on that premise, she's looking for the best possible outcome for life itself and evolution within the universe.

"But of course, she is at odds with the Doctor, though she's got a kind of respect for him - he has skills and qualities that would be useful to her. So she's giving him a chance to come on board here rather than simply imprisoning him and torturing and wanting to kill him.

"“And along with the Rani, we have another Pip and Jane Baker creation in the Tetraps - well, an augmented version of them in the shape of Malvore. They're quite a striking image, a distinctive creature from the latter years of the classic series."

Writer Rochana Patel added: "Yes, the Tetraps are back! They’re a fascinating species with lots of story potential that can be used in many different ways. The last time we encountered them, they were just brutish henchman who betrayed and strung up the Rani - which is a behaviour she would never tolerate, but nature is her plaything and she can easily fix problems like that..."