The last core attached to GLaDOS is the Anger Core. It has a red "eye" with eight dots beneath it. It is also referred to as the Emotion Core. Rather than speak, the Core snarls and growls ferociously at Chell. (These snarls and growls were later used in Valve's game Left 4 Dead, which featured the same actor, Mike Patton, as the infected.) Once Chell puts the Anger Core into the Incinerator, GLaDOS begins to implode. In Portal 2, GLaDOS, due to the loss of this core, sounds very mellow.