A three-part webisode series, entitled The Oath, was released on October 1, 2013. This series tells the origin of the "Don't Open, Dead Inside" paint on the cafeteria doors of the hospital Rick Grimes awakes in, post-apocalypse. It follows Paul and Karina as they escape their zombie-overrun camp in search of a medical station. The central theme of the series examines the will to persevere in the face of inevitable death.[186]