It included Mark Wakefield, Mike Shinoda, Rob Bourdon, Joe Hahn, Brad Delson and Dave Farrell of Linkin Park. The original name they chose was SuperXero but it was revised to Xero.
The band made one demo tape, which included the songs "Fuse" "Reading My Eyes", "Stick N' Move" and "Rhinestone". The project floundered and they never achieved much success.
After Mark Wakefield left to become the manager for Taproot the rest hired new vocalist Chester Bennington, formerly of the band Grey Daze, and made the Hybrid Theory EP under the band name Hybrid Theory, which later became Linkin Park.
Although there are very few recordings available online, there was a brief concert featuring Xero opening for Cypress Hill. Although the main concert hasn't been confirmed, it is at least known that the concert did exist, and with more songs than the original Xero Demo Tape had on it.