The Doctor Who Christmas special will see a major character make surprise return.Captain Jack Harkness will return to Doctor Who in earnest for the first time in a decade this festive season.Revolution Of The Daleks, set to air on Christmas Day, will see John Barrowman reprise the role of the fearless alien hunter as he aids Yaz, Ryan and Graham in their battle against the show's most famous villains.Meanwhile, Jodie Whittaker's Doctor remains unable to help them in their fight, trapped inside a