Prepare for more paranormal thrills, chills and excitement as Warehouse 13 returns with more action-packed mysteries than ever before! After the destruction of the Warehouse, the agents risk the use of a mythical artifact in an attempt to restore all they've lost. But the use of this dangerous artifact could change the Warehouse team and the world forever. Featuring guest appearances by Brent Spiner (Star Trek: The Next Generation), Sam Huntington (Being Human) and other sci-fi favorites, this five-disc set includes all 20 Season Four episodes plus a cache of classified bonus content including a never-before-seen chapter of the animated web series "Grand Designs." - Prepare for more paranormal thrills, chills and excitemen...