TNT to air Supernatural marathon on February 21 February 19, 2011 News TNT will air 9 hours of Supernatural on Monday, February 21. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on Tumblr (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on Reddit (Opens in new window) Related