It's been confirmed that the third season of Torchwood will consist of only five episodes, at least one of which will be written by creator Russell T Davies. The episodes will form one big story arc. They're expected to air on consecutive nights in early 2009 on BBC One (the first two seasons were aired on BBC Two and BBC Three). John Barrowman is the only cast member confirmed to be returning, although season two guest star James Marsters has said he'll also return.