Heathen is an American thrash metal band originating from the San Francisco Bay Area, active from 1984 to 1993 and again from 2001 onwards. Despite never achieving commercial success, the band is often credited – alongside Exodus, Testament, Forbidden, Death Angel and Vio-lence – as one of the leaders of the Bay Area thrash metal scene of the mid-to-late 1980s, and they have gone through several lineup changes, leaving guitarist Lee Altus as the only constant member. To date, Heathen has released four studio albums: Breaking the Silence (1987), Victims of Deception (1991), The Evolution of Chaos (2009) and Empire of the Blind (2020).

Exodus is an American thrash metal band formed in 1979 in Richmond, California. Their current lineup consists of guitarists Gary Holt and Lee Altus, bassist Jack Gibson, drummer Tom Hunting, and lead vocalist Steve "Zetro" Souza. There are no original members left in Exodus other than Hunting, who has departed from the band twice, in 1989 and 2004, but rejoined in 2007. Exodus is also notable for including a then-unknown Kirk Hammett, who was the band's lead guitarist from its inception to his departure in 1983, when he left to join fellow Bay Area thrash metal band Metallica as Dave Mustaine's replacement. Holt has been most consistent member throughout various lineup changes and breakups, and is the only member to appear on all of Exodus' recordings. Much of the band's career has also been affected by feuds between both band members and record companies, two extended hiatuses, deaths of former band members and drug addictions.