Supersonic and Demonic Relics is a compilation album by Mötley Crüe. It was released in 1999 on Mötley Records. The album is a collection of unreleased tracks as well as rare material, including songs from the limited edition Quaternary EP, Decade of Decadence, demos, and live tunes.
The compilation features the songs "Primal Scream", "Angela" and "Anarchy in the U.K.", which were all originally recorded specifically for the group's first compilation album Decade of Decadence in 1991. The cover song "Teaser", also first issued on Decade of Decadence, was released as a single for this album. It charted at number 35 on the Mainstream rock charts.