'The Unholy Alliance: Chapter III', throughout October and November 2008. Slayer headlined the second Mayhem Festival in the summer of 2009. Slayer, along with Megadeth, also co-headlined Canadian Carnage, the first time they performed together in more than 15 years when they co-headlined four shows in Canada in late June 2009 with openers Machine Head and Suicide Silence. The band's eleventh studio album, World Painted Blood, was released by American Recordings. It was available on November 3 in North America and November 2 for the rest of the world. The band stated that the album takes elements of all their previous works including Seasons in the Abyss, South of Heaven, and Reign in Blood. Slayer, along with Metallica, Megadeth, and Anthrax performed on the same bill for the first time on June 16, 2010 at Bemowo Airport, in Warsaw, Poland. One of the following Big 4 performances in (Sofia, Bulgaria, June 22, 2010) was sent via satellite in HD to cinemas. They also went on to play several other dates as part of the Sonisphere Festival. Megadeth and Slayer joined forces once again for the American Carnage Tour from July to October 2010 with opening acts Anthrax and Testament, and European Carnage Tour in March and April 2011. The "Big Four" played more dates at Sonisphere in England and France for the first time ever. Slayer returned to Australia in February and March 2011 as part of the Soundwave Festival and also played in California with the other members of the "Big Four". In early 2011, Hanneman was diagnosed with necrotizing fasciitis. According to the band, doctors said that it likely originated from a spider bite. Araya said of Hanneman's condition: "Jeff was seriously ill. Jeff ended up contracting a bacteria that ate away his flesh on his arm, so they cut open his arm, from his wrist to his shoulder, and they did a skin graft on him, they cleaned up ... It was a flesh-eating virus, so he was really, really bad. So we'll wait for him to get better, and when he's a hundred percent, he's gonna come out and join us." The band decided to play their upcoming tour dates without Hanneman. Gary Holt of Exodus was announced as Hanneman's temporary replacement. Cannibal Corpse guitarist Pat O'Brien filled in for Holt during a tour in Europe. On April 23, 2011, at the American Big 4 show