Doctor Who will keep viewers on the edge of their seat with its new two-parter format.

'Doctor Who' Season 9: Twelve To Become 'Quite Funny', Steven Moffat Talks Change From A Dark Season 8

We all know the Doctor will make his grand schemes come to fruition right under the wire, and showrunner Steven Moffat wants to rid the series of that apparent safety net. To do so, season 9 will be sprinkled with several two-part episodes, starting with the premiere.

"Writing the first two-parter that I had done in years [with Dark Water/Death in Heaven] I just thought, I'm liking this. This feels more unpredictable.' Because you don't know how far you're going to get through the story," Moffat explained to Doctor Who Magazine (via Doctor Who TV). "The rule I've got is that you won't be absolutely certain whether a show is going to be a two-parter or not. And sometimes something that looks like it's going to be a single, isn't a single. I think the nice thing is not having the feeling of, 'It's five minutes until the end of Doctor Who, so he's bound to start running now."

'Doctor Who' Season 9 Premiere: Twelve Is In Trouble, Can Clara Trust Missy's Help? New Set

Find out more when Doctor Who returns to the BBC and BBC America this fall. Click the video to see Clara (Jenna Coleman) and Missy (Michelle Gomez) filming for the first two episodes, "The Magician's Apprentice" and "The Witch's Familiar."

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Doctor Who, Television, BBC, BBC America