August 6, 2006

The first season of the animated show Metalocalypse originally aired on Adult Swim from August 6, 2006 to December 17, 2006 with 20 episodes. The show follows virtual death metal band Dethklok. The majority of the music featured this season was released on the 2007 album, The Dethalbum.

September 23, 2007

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.

November 8, 2009

The third season of the animated show Metalocalypse originally aired on Adult Swim from November 8, 2009 to October 24, 2010 with 10 episodes. The show follows virtual death metal band Dethklok. This season featured a 21 minute runtime.

April 29, 2012

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.