Doctor Who is preparing to film the fifth installment of season 9.

'Doctor Who' Season 9: Is A Second Companion In The Cards [POLL]? Possible Characters To Join The TARDIS

The BBC series has completed two blocks of filming for episodes 1-4, and the Doctor (Peter Capaldi) and Clara (Jenna Louise Coleman) will soon have a new adventure on their hands. Shooting for the fifth episode will begin later in March, according to Doctor Who TV.

Unlike the previously filmed episodes, the untitled installment will not be a two-parter.

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

Showrunner Steven Moffat recently announced the iconic programs decision to switch up their standard single-episode format for the ninth season.

"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."

Find out more when Doctor Who returns to the BBC and BBC America this fall. Click the video below to see a video from the set of episodes 1 and 2, "The Magician's Apprentice" and "The Witch's Familiar."