Alien Menace is a Science Fiction card game for 2 players. One player plays as the marines and the other the aliens. Each player has a unique deck of cards. The board is made of cards representing different rooms drawn from a separate deck each turn. The marine travels these rooms and fights aliens creatures, trying to find the portal in order to stop the alien invasion. Cards represent events, weapons, or creatures that players use to beat each other in combat. The game also uses flipping tokens to add bonuses and randomness.