Premise: Metalocalypse: The Doomstar Requiem - A Klok Opera is a rock opera special for the Adult Swim animated series Metalocalypse. It was announced on May 10, 2013, by Adult Swim and was released on October 27, 2013. The special picks up directly after "Metalocalypse" season 4. It featured all new music from Dethklok, which was released on a soundtrack album on October 29, 2013.
Hypothesis: "Metalocalypse" season 4 was released before October 27, 2013.