BBC One has released 20 images from the Series 9 premiere of "Doctor Who."

The first episode in a two-part opener, “The Magician’s Apprentice" marks the return of Michelle Gomez as Missy, the current incarnation of the Master. Here's the official description:

“Where is the Doctor? When the skies of Earth are frozen by a mysterious alien force, Clara needs her friend. But where is the Doctor, and what is he hiding from? As past deeds come back to haunt him, old enemies will come face-to-face, and for the Doctor and Clara survival seems impossible …”

Written by Steven Moffat and directed by Hettie MacDonald (“Blink”), the episode of course stars Peter Capaldi and Jenna Coleman.

"Doctor Who" returns Saturday on BBC One and BBC America.