This PDF has scenarios and a mini-campaign system to play an Alien invasion in a post apocalyptic world. DoS is a supplement/scenario for the Two Hour Wargames 5150: New Beginings core game system. You must have the Chain Reaction 3.0 core rulebook to play this scenario (or 5150 Star Army). You can download Chain Reaction 3.0 for Free at Chain Reaction 3.0
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