It is the first installment to not be developed by Guerrilla Games directly.
mercenary | The Mercenary | Mercenary | The Mercenary (film) | Mercenary for Justice | Killzone 3 | Mercenary War | Mercenary (band) | Killzone: Mercenary | Killzone 2 |
The band caught attention from Killzone Records and Grammy Award Winning Producer Neil Kernon (Nile, Dokken, Nevermore, Queensrÿche, Judas Priest) to work on their sophomore album.
Killzone: Liberation is the only PSP installment in the series, and was followed by Killzone: Mercenary on the PlayStation Vita.