is an evolution of keyboardist Derek Sherinian's 1999 solo album Planet X
. Sherinian has stated in several interviews that his intention when forming Planet X was to create a band that "played their instruments so fiercely, that they would strike fear in the hearts of all musicians"
. Sherinian has called the band's style "metal fusion".
After recording an eponymous solo album, Derek Sherinian (formerly of the progressive metal band Dream Theater) expanded the album's line-up to full time duty in conjunction with drummer Virgil Donati.
To date they have released three studio albums and one live CD. On the
recorded albums, the band works with multiple guest guitarists. (Tony MacAlpine is the guitarist on the first three Planet X albums - in 2004 he left to tour with Steve Vai).