The Doctor faces off with the Time Lords in a struggle that leads them to the end of time on Doctor Who. "Hell Bent" is the 12th episode of the show's ninth season.
The Doctor gets tough with Ashildr once he realizes Clara's life is in danger. Unfortunately, Ashildr never imagined Clara would voluntarily take on Rigsy's sentence.
The President of the World (aka The Doctor) boards his plane in an effort to stop the Zygon invasion. However, Bonnie (evil Clara) appears to have shot it out of the sky. How does the Doctor survive?
What have we got? What do we know? It's not an attack. It's not an invasion because, well that doesn't come with a fair warning. So, somebody needs our attention. Somebody who needs to put a gun to our heads to make us listen.
