The most important part of the latest episode of “Doctor Who,” “In the Forest of the Night,” was the preview for the next installment. It’s the first half of the Season 8 finale and what looks to be the beginning of the end of Clara Oswald as companion.
Though only 35 seconds long, the promo for “Dark Water” shows a very different tone than that’s been seen he rest of the season, and it’s mostly due to Clara. Whatever has been brewing inside of her this season is finally ready to explode and it’s bad news for the Doctor.
In the preview, she confiscates the TARDIS. “Do I have you attention?” she asks. “You will never step inside your TARDIS again.” Her claim is that time will be rewritten, something that was briefly mentioned by the Doctor during “In the Forest of the Night.”
With trees overpowering the earth, he made it seem possible for all futures they’ve visited to simply be erased. If those changes in time are possible, then all bets are odd. Especially with Clara’s revelation that “Clara Oswald has never existed.” 
Of course, she’s saying that to a Cyberman, so it could mean any number of things. Though, considering she was chosen by Missy, perhaps the companion isn’t who anyone thinks she is. Was she sent to the Doctor, simply to get close to and compromise him? If so, it’s the ultimate possible betrayal for the Doctor.
If he can’t trust his companion, who can he trust? There’s also the question of where Danny plugs into all of this. He truly loves Clara and sees himself spending the rest of his life with her. If the person he thinks is Clara is a tool to get to destroy him, how will he react?
One thing’s for sure, it doesn’t look like it’s going to be a heartbreaking exit for Clara, which Whovians have gotten used to seeing when companions say goodbye. Instead, it seems she’ll be going out with a bang. Hold onto your seats, Clara is taking you on a crazy ride.
Posted by:Chris E. Hayner

Chris E. Hayner is equal parts nerd, crazy person and coffee. He watches too much TV, knows more about pro wrestling than you do and remembers every single show from the TGIF lineup. You may have seen him as a pro-shark protester in "Sharknado 3." His eventual memoir will be called "You're Wrong, Here's Why..." TV words to live by: "I'm a firm believer that sometimes it's right to do the wrong thing."