It certainly looks like Twelve is not in the mood for games in the new clip from the 'Doctor Who' episode 'Heaven Sent!'

The second episode of the three-part series finale will find the Twelfth Doctor (Peter Capaldi) without a companion for the first time, since Clara Oswald (Jenna Coleman) was killed unexpectedly (for him, anyway) in 'Face the Raven.' The death of his beloved companion is a huge factor to the way the Time Lord is feeling in the clip.

The synopsis for the clip reads as follows:

"Trapped, alone and grieving, The Doctor is keen to find those responsible for his pain."

The clip begins with the Twelfth Doctor scooping up a handful of sand and realizing where it has come from. "If you think because she's dead I'm weak, then you understand very little," he says. "If you were any part of killing her and you are not afraid, then you understand nothing at all."

The Time Lord is clearly furious as he delivers the rest of his threat.

"So for your own sake, understand this: I am The Doctor. I'm coming to find you and I will never, ever stop."

The Doctor is referring to the death of Clara Oswald in the first part of his threat, since his Companion died by taking the chronolock clock from Rigsy without the Time Lord's knowledge. Although several incarnations of the character have died in the previous series, it has been confirmed that her fate in 'Face the Raven' is Clara's final death.

In addition to being the first episode to feature a companion-less Doctor, 'Heaven Sent' does not feature any other character except for the monster known as The Veil (Jami Reid-Quarrell).

'Heaven Sent' was written by Steven Moffat and directed by Rachel Talalay. The episode will air on November 28.