Double Damage is a Power-up in SAS: Zombie Assault, SAS: Zombie Assault 2, and SAS: Zombie Assault 2 Insane Asylum. It doubles the damage of the player's weapon for thirty seconds in SAS: Zombie Assault, and twenty-seven seconds in SAS 2/Insane Asylum.
Its appearance differs between SAS and SAS 2/Insane Asylum. In SAS, it is a glowing, rotating circle with "X2" written on it, while in the others it is a skull with two bullets in place of where crossbones usually are in a typical 'skull and crossbones' design. In SAS 2 and its expansion, the damage time is decreased by three seconds.