Tardis:Sandbox

 was the first episode of the tenth series of Doctor Who produced by BBC Wales. It introduced the Twelfth Doctor's new companion, Bill Potts.

According to Steven Moffat in a video introduction, "series 10 sort of begins the show again. [The Pilot] introduces everything you need to know about Doctor Who, and tips you into the universe". Indeed, through Bill's eyes now, viewers are introduced again to the character of the Doctor, his TARDIS, his enemies the Daleks, and his versatile tool, the sonic screwdriver.