Clash of the Titans was the name of a worldwide tour by several popular American thrash metal

Thrash metal

Thrash metal is a subgenre of heavy metal that is characterized usually by its fast tempo and aggression. Songs of the genre typically use fast percussive and low-register guitar riffs, overlaid with shredding-style lead work...

 bands of the 1980s, with alternating headliners from show to show.
The tour began in 1990 with a European leg featuring Megadeth

Megadeth

Megadeth is an American heavy metal band from Los Angeles, California which was formed in 1983 by guitarist/vocalist Dave Mustaine, bassist Dave Ellefson and guitarist Greg Handevidt, following Mustaine's expulsion from Metallica. The band has since released 13 studio albums, three live albums, two...

, Slayer

Slayer

Slayer is an American thrash metal band formed in Huntington Park, California, in 1981 by guitarists Jeff Hanneman and Kerry King. Slayer rose to fame with their 1986 release, Reign in Blood, and is credited as one of the "Big Four" thrash metal acts, along with Metallica, Megadeth and...

, Testament

Testament (band)

Testament is an American metal band from Berkeley, California, formed in 1983. They are often credited as one of the most popular bands of the 1980s thrash metal scene...

 and Suicidal Tendencies

Suicidal Tendencies

Suicidal Tendencies is a U.S. crossover thrash band founded in 1981 in Venice, Los Angeles, California by Mike Muir, its leader and only permanent member. The band is sometimes credited as one of "the fathers of crossover thrash"...

. A second leg in 1991 in the United States and Canada with a slightly different lineup; this time with headliners Megadeth

Megadeth

Megadeth is an American heavy metal band from Los Angeles, California which was formed in 1983 by guitarist/vocalist Dave Mustaine, bassist Dave Ellefson and guitarist Greg Handevidt, following Mustaine's expulsion from Metallica. The band has since released 13 studio albums, three live albums, two...

, Slayer

Slayer

Slayer is an American thrash metal band formed in Huntington Park, California, in 1981 by guitarists Jeff Hanneman and Kerry King. Slayer rose to fame with their 1986 release, Reign in Blood, and is credited as one of the "Big Four" thrash metal acts, along with Metallica, Megadeth and...

 and Anthrax

Anthrax (band)

Anthrax is an American heavy metal band from New York City, formed in 1981. Founded by guitarists Scott Ian and Danny Lilker, the band has since released ten studio albums and 20 singles, and an EP featuring Public Enemy. The band was one of the most popular of the 1980s thrash metal scene...

, and supporting act Alice in Chains

Alice in Chains

Alice in Chains is an American rock band formed in Seattle, Washington, in 1987 by guitarist and songwriter Jerry Cantrell and original lead vocalist Layne Staley. The initial lineup was rounded out by drummer Sean Kinney, and bassist Mike Starr...

. Originally the Bay Area thrashers

Bay Area thrash metal

Bay Area thrash metal, or "Bay Area thrash", referred to a steady following of heavy metal bands in the 1980s who formed and gained international status in the San Francisco Bay Area, California...

 Death Angel

Death Angel

Death Angel is a Filipino-American thrash metal band from Concord, California, initially active from 1982 to 1991 and again since 2001. Death Angel has released six studio albums, two demo tapes, one box set and two live albums....

 were supposed to be the supporting act, but after an accident which almost took drummer Andy Galeon's life, the band was forced to decline the offer.

On November 16, 2009, it was announced that the European Clash of the Titans lineup would be reunited after almost 20 years on the "American Carnage Tour" featuring Megadeth

Megadeth

Megadeth is an American heavy metal band from Los Angeles, California which was formed in 1983 by guitarist/vocalist Dave Mustaine, bassist Dave Ellefson and guitarist Greg Handevidt, following Mustaine's expulsion from Metallica. The band has since released 13 studio albums, three live albums, two...

, Slayer

Slayer

Slayer is an American thrash metal band formed in Huntington Park, California, in 1981 by guitarists Jeff Hanneman and Kerry King. Slayer rose to fame with their 1986 release, Reign in Blood, and is credited as one of the "Big Four" thrash metal acts, along with Metallica, Megadeth and...

 & Testament

Testament (band)

Testament is an American metal band from Berkeley, California, formed in 1983. They are often credited as one of the most popular bands of the 1980s thrash metal scene...

.