 David Greenwalt joined the staff in May 2007 as showrunner and executive producer with Joel Silver; however, health reasons forced Greenwalt to leave the series.All of the original actors, apart from the male lead role, were recast in June 2007, and Sophia Myles, Jason Dohring and Shannyn Sossamon replaced them.With an almost entirely different cast, a retooled, full-length pilot for television audiences was re-shot.