Steven Moffat explains the increase in two-part episodes 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.