Clash of the Titans was a concert tour co-headlined by American thrash metal bands Megadeth and Slayer, which took place in September and October 1990 and again from May to July 1991.

[1][2] The tour began in the fall of 1990 with a three-week European leg featuring Megadeth, Slayer, Testament and Suicidal Tendencies, promoting their then-current albums Rust in Peace, Seasons in the Abyss, Souls of Black and Lights...Camera...Revolution!

According to the documentary Get Thrashed, Death Angel was to be the supporting act – however, after a near-fatal tour bus crash, they were forced to bow out.

[3][4] Anthrax guitarist Scott Ian stated in an interview with Guitar World that they wanted Pantera as the opening act of the Clash of the Titans tour.

"[5] Interesting to note is that Metallica was the only "big four" of thrash metal act that did not take part in the Clash of the Titans tour.

Slayer guitarist Kerry King told Guitar World that, "There might have even been talk of a 'Big Four' tour back then, but we probably couldn't get Metallica onboard.

Three-fifths of the European lineup (Megadeth, Slayer and Testament) were reunited on the American Carnage Tour that took place from July to early September 2010.

[12] On December 9, 2017, Ultimate-Guitar.com reported that a rebooted Clash of the Titans tour featuring Megadeth, Slayer, Testament and Sepultura was in the works, and scheduled to take place in 2018 or 2019 in support of new albums from these four bands.

[17][18][19][20] Although Mustaine cryptically denied that this tour was in the works,[21] he stated in a June 2018 interview with Rock Talk With Mitch Lafon that, "I hope that Megadeth and Slayer get to go one more round somewhere.