Quake 4 - Part 6: Brain Damage

The marines gave humanity hope in the beginning. Bitterman, Joker, Stepchild, The Machine, Viper... They made winning possible. Now, victory is in the hands of another marine, one who has given his very humanity to the cause. This is the moment that makes all the sacrifice, all the pain, all the death has led to. This moment will decide the fate of the human race; destroy the Nexus and reduce the strogg to ragtag, disconnected tribes, or fail and watch as the Strogg make another go at Earth itself.