The fourth season of the animated show Metalocalypse originally aired on Adult Swim from April 29, 2012 to July 15, 2012 with 12 episodes. The show follows virtual death metal band Dethklok. This season returned to the original 11-minute long episode format. The season four DVD/Blu-ray was released on October 30, 2012 through Adult Swim/Warner Home Video.
The second season of the animated show Metalocalypse originally aired on Adult Swim from September 23, 2007 to September 7, 2008 with 19 episodes. The show follows virtual death metal band Dethklok. The majority of the music featured this season was released on the 2009 album Dethalbum II. The first episode of this season, "Dethecution" was released as part of the deluxe edition of The Dethalbum. This season featured the new re-recorded version of the "Deththeme", released as a hidden track on The Dethalbum.