Warehouse 13 returns after a six month break for the second half of season 4. Not only that, but James Marsters and Polly Walker are along for the ride. When last we saw our heroes, Artie had gone evil and killed Leena as well as unleashing an airborne, world-ending plague. There are many answers, twists and breaking hearts on this mid-season premiere, so miss this at your peril! “The Living and the Dead” is written by Drew Z. Greenberg and directed by Millicent Shelton and airs Monday, April 29th at 10:00 PM on Syfy!