Doctor Who fans are about to get a Marvel crossover.  No, the good Doctor isn't stepping in for a role, but his companion is.  Karen Gillan has recently been cast in James Gunn's Guardians of the Galaxy in an unnamed role as the film's lead female villain.  She'll join Lee Pace and Michael Rooker on the evil side of the line, while Chris Pratt, Zoe Saldana, and David Bautista will be the film's heroic leads.  The odd assortment of actors also includes the recently-added Glenn Close and John C. Reilly, though when the lead characters feature a walking tree and a talking raccoon, "odd" becomes a relative term.  Production on Guardians of the Galaxy will begin in the next few months in London and the film opens on August 1, 2014.  News of Gillan's casting comes via Heat Vision.