The episodes titled Ascension of the Cybermen and The Timeless Children will see the return of the Cybermen and an answer to the Timeless Child mystery.
Speaking about the Ascension of the Cybermen:
Chibnall said -
“Ascension of the Cybermen is set at the end of the great cyber war, this is a conflict that’s reduced both the Cybermen and humanity to barely anything. It’s the last remnants of the Cybermen against the last refugees of humanity in this corner of the universe"He also added -
“Its is one of those episodes where the Doctor and her friends are all on the run from different threats. We head into the next episode with the jeopardy of whether they’re ever going to meet up again…”However we it came to the The Timeless Children, Chibnall kept his cards a little closer to his chest -
“I can’t tell you anything about this episode, The Timeless Child is mentioned as far back as The Ghost Monument, and the final episode of this series is where some of those questions get answered. It’s a huge, emotional finale with lots of Cybermen. And it runs for 65 minutes"He also added -
"It’s both epic, and personal. This is what you’re always looking for in a series finale – the way the big, universe-threatening story impacts on the personal lives of your characters. And categorically that’s what’s happening in this episode.”Chibnall also spoke about the Doctor and her Companions journey this season -
“In Spyfall Part One they are buoyant and they’re having fun. Where we leave them at the end of episode 10 is an entirely different place.”