The episode picked back up with Ruby Sunday (Gibson), following her departure from the TARDIS in season 14 finale Empire of Death, finding her settled down with new boyfriend Conrad (played by The Little Mermaid's Jonah Hauer-King).
The episode came to a head as UNIT's own Kate Lethbridge-Stewart (Jemma Redgrave) unleashed a very real monster on the cynical podcaster, who had previously attempted to ambush and dox its operatives.
"I can say that Jonah comes back – the battle is not won," teased Gibson on last night's episode of The One Show.
On her replacement, Gibson added: "She's an amazing companion so it was really great to get that three-person dynamic in the TARDIS, you don’t really see that often. There's a lot to come!"
Doctor Who is available to stream on BBC iPlayer. New episodes release weekly on Saturdays.
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