On Mars Alien Invasion Expansion GameDescriptionSpecificationsShipping On Mars: Alien Invasion is the much anticipated Somewhat Cooperative Expansion to Vital Lacerdas best selling and highly rated On Mars base game. Though this expansion was originally going to be named Surviving Mars, Eagle Gryphon Games made the decision to change the name to On Mars: Alien Invasion to better reflect the theme and content of this expansion. The game narrative is contained in four chapters of a story