Keeley Hawes will bring a double dose of villainy to Doctor Who this fall.

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A mysterious and powerful, Hawes will play the "out-of-this-world" Ms. Delphox in the allegedly titled "Time Hiest." Set to air as the fifth episode of season 8, the Steve Thompson penned episode will place Clara and the Doctor on a strange new world where they must go up against this new baddie.

"She's great," Coleman said of Hawes, according to Entertainment Weekly. "She's playing this naughty but nice, really sexy villain who kind of kills you but with a sweet smile."

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Donning a sharp suit and wing tip glasses in her Doctor Who portrait, Ms. Delphox will seem even more imposing thanks to her Scrooge-esque career.

Hawes "achieves the greatest villainy yet attempted on Doctor Who," according to showrunner Steven Moffat (via CultBox). "She plays a banker."

Find out more about Clara, the new Twelfth Doctor, and Ms. Delphox when Doctor Who returns to the BBC and BBC America on Aug. 23 with a feature-length season 8 premiere. Click the video below to see a new trailer.

Tags: Doctor Who television BBC BBC America