Captain Jack stars in a very special Doctor Who episode
John Barrowman isn't just Captain Jack Harkness on Doctor Who and Torchwood. He also is a variety show host for a BBC series called Tonight's The Night which allows contestants to live out their performance dreams. Using his association with the former, he actually gave a contestant on the latter the chance to live out his dream of appearing on Doctor Who.
It's a cute scene which obviously doesn't fit into any sort of show continuity (or as much continuity as Doctor Who can have). David Tennant himself makes a special appearance in the episode and steals the show. Watching Tennant's brief cameo in this show, I'm even more convinced that Matt Smith has big shoes to fill when he eventually takes over the role.
On the other hand, if your dream is to appear on an episode of Doctor Who, why would you allow your face to be covered by a blue mask? Watch the video after the jump.