Mark Gatiss will dip his toe into the Doctor Who universe once more in season 10.

The writer has delivered eight episodes into fans waiting hands, bringing us such adventures as "The Idiot's Lantern," "Night Terrors," "Robot of Sherwood," and "Cold War" amongst others. As production moves forward for Twelve's (Peter Capaldi) third year in the TARDIS, Gatiss will send the Doctor on another wild ride.

Speaking with WhoSFX about his first Doctor Who episode, "The Unquiet Dead," Gatiss dropped the tidbit while lamenting the short duration of current Who episodes.

"It seems so natural now (as I write my ninth episode - ten if you count the un-produced one!) but the forty five minute format took some getting used to," the multi-hyphenate talent explained.

So, what does this mean for fans? For starters, it fills in the by line for at least one of 2017's 13 episodes. More over, it could mean Gatiss is working on a sequel to last season's "Sleep No More." Plot lines tend to get dropped as a series changes showruners, and, with Steven Moffat's departure looming on the horizon, this could be Twelve's last chance to revisit the nightmarish tale of insomnia.

"It does have an unhappy ending, yes," Gatiss said of the Doctor's shocking defeat at the hands of the episode's insidious villain, according to the Radio Times. "It doesn't mean they're going to win eventually. The Doctor knows something's wrong, so he's not fooled...and I do have a sequel planned."

Hmmm...would you like to see the Time Lord and Bill (Pearl Mackie) track down the video from "Sleep No More"? Sound off in the comments below!

Doctor Who will return to the BBC and BBC America on Dec. 25 for the annual Christmas Special. Season 10 will begin in early 2017. Click the video below to see a preview for Gatiss' latest episode.