10 Doctor Who Episodes That Should Have Been Two-Parters

10. Sleep No More

Sleep No More is one of Doctor Who's most unique and polarising episodes. It's filmed entirely in a found-footage style, like one of those cheesy horror movies from last decade. But surprisingly it's actually executed quite well, and the found-footage isn't just a gimmick: it plays a key role in the episode. Essentially, villain-of-the-week Professor Gagan Rassmussen's evil plan is to spread the infection responsible for the Sandmen via glitches in a video feed. That video feed is the episode you're watching, and you are the target for the infection. Basically, Rasmussen fabricated a Doctor Who episode and then used that episode for his nefarious schemes.

It's an ingeniously meta concept and it's genuinely unnerving, but what makes this episode feel somewhat unfinished is that the Doctor and Clara fail to save the day at the end of the story. They don't stop Rasmussen, they don't figure out what was really going on, and they allow lots of victims -- including you, the viewer -- to be turned into Sandmen. This episode ends on a great cliffhanger, but there's no resolution: there really should have been a Part 2 where the Doctor and Clara figured out what was happening and resolved the plot. Maybe then this unique and ambitious episode would've been remembered as a standout story.