The Bacterium Empire Series are the main bosses in Konami's Gradius video games. "Big Core" serves as the standardized design, with every other ship following the same principles: A central power core protected by a set of ablative barriers. Sometimes following a famous on-screen prompt to "SHOOT THE CORE!", the player'sship must destroy the barriers, then the power core, in order to defeat the boss, all while dodging enough weapon's fire to typically fill the game screen. "SHOOT THE CORE!" or the variation "DESTROY THE CORE!" has become something of a catch-phrase among fans of the game.