Fans and critics alike continue to praise this season of Doctor Who, which many would argue showcases the many talents of 12th Doctor Peter Capaldi.

The Doctor Who train keeps rolling, though, next week, with an all-new episode. Hopefully, by then, fans will have recovered from one of the best speeches the 12th Doctor has ever given and can focus their attention on an all-new adventure.

Next week, the Doctor and Clara land on a planet where society has figured out how to conquer the need for sleep. Of course, messing with nature is never a good idea, and because of their meddling with the natural process of sleep, they created a monster.

The preview begins with the Doctor and Clara (Jenna-Louise Coleman) landing on a quiet space station that was busy just the day before. The two must put the pieces of the puzzle together to figure out exactly what happened. Of course, that means going up against a monster, but how will the Doctor defeat it?

Meanwhile, fans of the series have started anticipating the departure of Coleman from the show, with many theories running rampant about how Clara's adventures with the Doctor concludes. Could this episode, "Sleep No More," be the beginning of the end for her?

Whatever the case, Capaldi warns viewers that Clara's exit will bring tears.

"I don't want to go into what happens, because it's very clever what happens in it, but it's very sad," said Capaldi to Radio Times. "It's really sad. It's not quite what you think is going to happen. You think what's going to happen is going to happen, and then something else happens. That's what's wonderful about Doctor Who. It's always clever the way these things are done. It's not quite as straightforward as it appears."

This also means that there is already speculation about who will take Coleman's place. However, the BBC recently stated that it won't be anyone Who viewers are already familiar with (sorry, Osgood fans).

"I'm not making any promises, but that's my genuine belief at the moment," said Moffat to Digital Spy. "Because I think to throw away the chance to say 'You can start here' is foolish. If you say, 'You could start here, but [the companion is] somebody you have to know all about' then you've lost that. I think every time we get a new companion — even more so than a new Doctor — you are sort of saying, 'This is the beginning. This is where it starts. You can join in here.'"

Doctor Who airs on BBC America on Saturdays.

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