“I confess: I know the Hybrid is real,” the Doctor proclaims. “I know where it is, and what it is. I confess: I am afraid.”
Features The Doctor, Clara, Ohila and the Sisterhood of Karn, and “many more”…
Steven Moffat told DWM: “Episode 11 pushes the Doctor to the brink of madness, and Episode 12 is what happens next. If the Doctor has lost his moral compass, if he’s being selfish, if you really, really hacked him off, if you really got him angry and gave him nothing to fight for.. what would you end up with?
That’s the ‘hellbent’ of the title. An angry, off-the-rails Doctor.”
Steven Moffat also revealed to Blogtor last week that the finale will feature “cameos” of returning monsters but “not in a major way.”