In July 2010, after the European "big four" shows, Megadeth and Slayer commenced the first leg of the American Carnage Tour, where Megadeth played "Rust in Peace" in its entirety, while Slayer performed its album "Seasons in the Abyss", both of which were released in 1990. From these shows onward, Vic Rattlehead started making sustained onstage appearances, to improve the visual facet of Megadeth's live performances. Shortly afterward, the two bands united with Anthrax for the Jägermeister Music Tour in late 2010. During the final show of the tour, Kerry King joined Megadeth on stage at the Gibson Amphitheatre in Hollywood to perform Megadeth's "Rattlehead". It was the first time that King had performed onstage with Megadeth as the latter's early shows in 1984. Megadeth and Slayer again shared the stage for the European Carnage Tour in March and April 2011. Megadeth also headlined the fourth annual Rockstar Mayhem Festival in July and August the same year.