As 'Doctor Who' prepares to pull the curtain on the second half of its final season this Satruday with "The Bells of St. John," preparations for the mysterious 50th anniverary special have already begun. We've heard rumors every which way surrounding past Doctors and guest stars resurfacing for the milestone event, but has former 'Torchwood' and current 'Arrow' star John Barrowman rescinded his involvement? Find out the latest rumors on 'Doctor Who's big anniversary special inside!

The moderate performance of Starz' Americanized 'Torchwood' series 'Miracle Day' largely assured that Captain Jack Harkness (John Barrowman) would remain dormant for the foreseeable future. Recently, fans were allotted hope for the character as Barrowman himself seemed to confirm that the character would have "involvement" with the forthcoming 'Doctor Who' 50th anniversary special, but now it seems the prospect has fallen through.

Barrowman today took to Twitter to announce "I will not be involved in the 50th Anniversary Episode of Dr WHO," seemingly shutting the door on an appearance of his immortal character and dashing fan hopes. Granted, plenty of writers and actors have been known to spread misinformation as a means to keep spoilers under wraps, Barrowman's approach seems a bit too direct to be misleading.

Plenty could change between now and the 'Doctor Who' 50th anniversary special, but what say you? Are you disappointed Barrowman's Captain Jack Harkness won't appear? Check out the latest trailer for 'Doctor Who' season 7 below, and check out the premiere of new episodes this Saturday, March 30!