"Kerrang!" released a tribute album titled "Master of Puppets: Remastered" with the April 8, 2006, edition of the magazine to celebrate the 20th anniversary of "Master of Puppets". The album featured cover versions of Metallica songs by Machine Head, Bullet for My Valentine, Chimaira, Mastodon, Mendeed, and Triviumall of which are influenced by Metallica. At least 15 Metallica tribute albums have been released. On September 10, 2006, Metallica guest starred on "The Simpsons" eighteenth-season premiere, "The Mook, the Chef, the Wife and Her Homer". Hammett's and Hetfield's voices were used in three episodes of the animated television series "Metalocalypse". Finnish cello metal band Apocalyptica released a tribute album titled "Plays Metallica by Four Cellos", which features eight Metallica songs played on cellos. A parody band named Beatallica plays music using a combination of The Beatles and Metallica songs. Beatallica faced legal troubles when Sony, which owns The Beatles' catalog, issued a cease and desist order, claiming "substantial and irreparable injury" and ordering the group to pay damages. Ulrich, a fan of Beatallica, asked Metallica's lawyer Peter Paterno to help settle the case.