The 5 Craziest Doctor Who Series 15 Finale Rumours (That Might Be True)

Feature by Albert Connors

As we speed towards the final three episodes of Doctor Who Series 15, the rumours are completely wild right now. The Whoniverse has always been a breeding ground for out-there theories and rumours, but this latest batch feels different. The leaker behind many of them so far has been right more often than not this season, so I couldn’t help diving deeper and pulling everything together.

Of course, it’s all still unconfirmed, but if you’d rather not take any chances and go into the final three episodes completely unspoiled, now’s your cue to look away. For everyone else, continue under this picture…

So here are the wildest, weirdest, and maybe even true spoilers currently swirling through time and space…

5. Mrs Flood is the Rani

For years, it has been a running joke that any mysterious woman in Doctor Who must be the Rani. But this time, it might actually be happening.

For those newer to the lore, the Rani is a rogue Time Lord, known for her cold intellect and cruel experiments. She first appeared in the classic era, in The Mark of the Rani, portrayed by Kate O’Mara, and was last seen on screen in Time and the Rani, ignoring the 1993 Children in Need special Dimensions in Time(and you really should!).

According to persistent leaks, Mrs Flood will reveal herself as the Rani at the conclusion of this weekend’s “The Interstellar Song Contest”. In an unexpected twist, a bi-generation (first introduced in “The Giggle”) occurs again, splitting Mrs Flood into two versions of herself. A younger version of the Rani emerges, played by an as-yet-unconfirmed actress, with speculation pointing towards Archie Panjabi.

Episode 7, “Wish World”, is said to open with scenes of the younger Rani galloping through a forest in Hungary. She appears to be orchestrating an elaborate, experiment, a plot that seems to tie directly into the series’ true villain. Which leads me to the next point…

4. Omega is the Big Bad

The mysterious “One Who Waits” may turn out to be Omega, one of the founding fathers of Time Lord civilisation. A legendary engineer believed lost to a black hole, Omega last appeared in Arc of Infinity (1983), and much like the Rani, has long been a favourite candidate for a return. His name is so frequently theorised in fact, it has become a bit of a running joke in fandom.

Now, it too might actually be happening.

The rumour claims that Mrs Flood, or rather the Rani, is working to summon Omega from a place known as the Underverse. That name was recently used by RTD in official press material, adding credibility to the theory. Somewhat controversially, Omega is said to manifest as a monstrous CGI creature with a huge claw and a voice allegedly resembling Gabriel Woolf (known for voicing last year’s big bad Sutekh).

3. Susan Foreman Finally Returns (Kind of)

Long-time fans, take note. Susan Foreman, the Doctor’s granddaughter, has been a subject of speculation for decades. She of course debuted in the first ever Doctor Who serial An Unearthly Child, and was last properly seen in The Five Doctors. Her name surfaced multiple times in Series 14, but no full return has occurred. Until now… perhaps.

The rumour suggests Carole Ann Ford, who originated the role, will appear in a cameo. However, it will not be a traditional return. Susan is said to appear as a glass avatar, similar to those seen in “Twice Upon a Time”, rather than in her original form.

Her appearance is said to take place either in “Wish World” or perhaps during a regeneration in “The Reality War”, which brings me to…

2. The Fifteenth Doctor Regenerates

Ncuti Gatwa may only be two series in, but according to rumour, his time could be up at the end of Series 15. Leaks claim the Fifteenth Doctor begins to regenerate in the finale.

There are two conflicting versions of this rumour. In the first, the Fifteenth Doctor begins to regenerate and sees a vision of the Thirteenth Doctor, in a moment reminiscent of Eleven seeing Amy during his farewell. The episode then ends without revealing the next Doctor, leaving the regeneration open-ended. Some believe this is a contingency plan in case the show is not immediately renewed, allowing the next incarnation to be cast or introduced later if needed.

The other rumour claims that a new Doctor is in fact shown, described by the leaker as “female and familiar”. Fans quickly began speculating after it was mentioned that the actress might have been spotted at last week’s BAFTAs. Names floated include Suranne Jones (Idris from “The Doctor’s Wife”), Joanna Page (Queen Elizabeth I in “The Day of the Doctor”), Billie Piper (Rose Tyler), Anna Maxwell Martin (Suki in “The Long Game”), Rose Ayling-Ellis (Aliss in “The Well”), and Nicola Coughlan (Joy in “Joy to the World”).

1. The Doctor’s Daughter is… Poppy?!

Of all the finale rumours, this one has to be the most bonkers. Poppy, one of the unsettling talking babies from “Space Babies”, may in fact be the Doctor’s daughter.

This all gained traction after last week’s episode, “The Story and the Engine”. While the Doctor is held by the Barber, Belinda wanders through the city and hears a mysterious giggle. She spots a young girl waving at her, only for the child to vanish moments later. When she tells the Doctor, he claims he saw nothing, but ominously notes that the “stories” are beginning to leak out and blur together.

At first, this might seem like a random, eerie beat, but there’s more to it. The child in question is credited as “Poppy”, and played by Sienna-Robyn Mavanga-Phipps, the same actress who played Poppy in “Space Babies”. She’s also credited again in the upcoming “Wish World”, strongly suggesting this is not a coincidence or simple reuse, but a deliberate, continuing character arc.

That continuity leads directly into another rumour about the penultimate episode. It’s said to take place on a strange, altered world where the Doctor is trapped by Mrs Flood, and comes to believe that he is Poppy’s father. Whether it is a psychic projection, a dream reality, or some kind of temporal manipulation is unclear, but it would explain Poppy’s reappearances and hint at a deeper, emotional payoff yet to come.

Conclusion

Of course, it is entirely possible that all of these rumours are complete nonsense. Doctor Who has always thrived on mystery, misdirection and fan speculation. Whether Mrs Flood is really the Rani, whether Omega is finally back with a giant claw, or whether the Doctor ends up with a baby daughter, remains to be seen. But the joy of Doctor Who has always been the thrill of guessing. As we hurtle towards the Series 15 finale, one thing is certain, we are in for one unpredictable ride.