Home > American TV Shows > True Blood producer thinks witches are vampires ‘greatest threat yet’ June 27th, 2011 by Lisa McGarry. No comments True Blood executive producer Alexander Woo has admitted that the vampires won’t be having an easy time of it this season. As well as the usual dissenters within their own ranks, humans who want to kill them and of course the werewolves, in the fourth run of the popular HBO show the vamps will also have to contend with a very dangerous coven of witches. Coven leader Marnie is played by True Blood newcomer, Harry Potter star Fiona Shaw and Woo explained that although at first her character will seem relatively harmless, she will turn out to be the ‘big bad’ of the series. “I’d say the witches certainly pose the greatest threat to the vampires that we’ve seen yet,” Woo told The Hollywood Reporter. “I think what [the witch coven] represents is the power of the human and sort of the power of life. “[Whereas vampires] represent death and it’s...