In 2013, the band hosted the comedy music festival Festival Supreme in Los Angeles, which would go on to host three more editions. In 2014, the band were invited to feature on "Ronnie James Dio – This Is Your Life", a compilation album where various artists cover Ronnie James Dio songs to raise funds for cancer. Their cover of ""The Last in Line"" won a Grammy for best heavy metal performance at the 57th Annual Grammy Awards. Following teases from Black and Gass regarding a second film, in late 2018, the band began independently releasing an animatic hand-drawn web series titled, "Tenacious D in Post-Apocalypto", each of the six episodes uploading exclusively to YouTube every week starting from the 28th of September. Columbia Records released the album "Post-Apocalypto" on November 2, 2018, just after the release of the sixth episode.