Daleks, Zygons, a mad man with a box — fasten your seat belts Whovians, because that's only a sliver of what you can expect with season nine of "Doctor Who," which premieres Saturday.

The Doctor and Clara are back for what lead writer Steven Moffat calls the duo's "glory years." Season nine marks Peter Capaldi's second as the Doctor, a role he has mastered with sharp wit and a chilly but caring demeanor (and incredible eyebrows). And now that the Doctor has reconciled his debate over whether he's a good man, the possibilities for his character seem endless.

"I think (viewers) will find a lot of thrills, lot of mystery, a reckless Doctor in pursuit of adventure," Capaldi said.

The Doctor and Clara's relationship is also back to normal after enduring post-regeneration mistrust and occasional clashes throughout season eight.

"They've had some conflicts and challenges, but generally if you can weather the storms, you often find that your relationship is much stronger," Capaldi said.

However, viewers are sure to see some noticeable differences in Clara's behavior following the death of her boyfriend, Danny Pink, last season. Jenna Coleman, who plays the role of Clara, noted that her character is starting to cut ties with Earth and lose herself in her adventures with the Doctor.

"Since losing Danny, her perspective has changed on life and in a way she's lost fear of her own mortality," Coleman said. "When that happens there's a sense of freedom — going into adventures, there's nothing holding her back. But as much fun as it is, it can be dangerous."

Outside of the main characters, season nine will be packed with guest stars — new faces and old. One of the most-talked about appearances is Maisie Williams, best known for her role as Arya Stark in "Game of Thrones." She's scheduled to appear in episode five, "The Girl Who Died," though Moffat and company have been hush-hush about what her role will be. We'll also see the return of Jemma Redgrave's Kate Stewart and Ingrid Oliver as Osgood (sure, she died last season, but this is "Doctor Who" we're talking about).

By far the most exciting addition to season nine is Missy, played by Michelle Gomez. She revealed herself as a regeneration of the Master last season and captivated viewers with her maniacal charm and twisted sense of humor. While the Doctor killed Missy in the season eight finale, the character's return has been public knowledge for quite some time.

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