In the comments section for “The Sontaran Stratagem,” Joan wondered why at the close of the episode “...no one thought to break the window of the car while Gramps was asphyxiating.” And so “The Poison Sky” begins with Donna’s mother, Sylvia, doing just that. It’s a huge anticlimax for the cliffhanger, but I would argue that the whole point of a cliffhanger is in the hang, not in the resolution in the next episode. Cliffhanger resolutions almost by their very nature are destined to suck, because if our heroes succumbed to the disastrous situations they’re left in, there would be no more show. We always want the resolve to be as thrilling as the minutes that preceded it in the narrative, but there’s a big difference in the first couple minutes of an episode, and the final moments of another. And there’s no point in delivering the best you’ve got at the start, right?