Who's next: End of an era as 'Doctor Who' gets a new star

LONDON -- "Doctor Who" fans around the world will tune in on Christmas Day to watch Peter Capaldi's final adventure as the space-hopping Time Lord known as the Doctor.

The show has had a dozen Doctors over its 54-year history, and this is one of those bittersweet moments when one lead actor hands over to another. At episode's end, viewers will see Capaldi transform -- through a Time Lord process known as regeneration -- into Jodie Whittaker, the first woman to play the part.

Before that comes a rollicking and poignant adventure that moves from the World War I trenches to the South Pole, features mysterious creatures made of glass and (of course) involves a jaunt in the Tardis, a time-and-space machine shaped like an old-fashioned British police phone box.

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