Can flying saucers and death rays beat out tanks, nukes and troopers? Find out with Army vs. Aliens, the first game in the Army vs. Aliens series, with each game being playable on its own while also allowing for any faction in one game to be played against any faction in another or for multiple sets to be combined for team games or "last man standing" challenge matches. In this fun take on alien invasion games, you get to choose whether you want to fight off alien forces as the army or whether you want be the aliens trying to conquer Earth. In the game, players roll dice to set their power — each army has one type of dice with six faces — so that they can destroy the other players' dice on a subsequent turn. Used dice are placed into an expended pile where they can later be rallied (re-rolled) to reset their power. Dice are ranked in power and can destroy any die of equal or lesser rank but the higher value dice have special abilities, e.g., Nukes on the Army side that destroy just about everything if you get three of them. On a player's turn, he has three options: (1) Attack with an existing die, (2) Rally any or all dice (including active ones) or (3) Use a special power. If five rounds pass without either player scoring, then the game ends and the player who has the most dice in his scoring zone wins.