In the latest edition of Doctor Who: The Fan Show, official BBC YouTuber Christel Dee confirmed that Peter Harness has returned to write for Doctor Who series 10. His previous timey-wimey credits consist of Kill The Moon, The Zygon Invasion and The Zygon Inversion.

“[Episode 6 and episode 7] are written by Steven Moffat and Peter Harness”, Dee revealed in the video linked above. Since Harness cowrote his Zygon episodes with Moffat, this collaboration shouldn’t come as a huge surprise.