On Mars: Alien Invasion is the highly-anticipated Somewhat Cooperative Expansion to Vital Lacerda’s 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 alter the name to On Mars: Alien Invasion to better reflect the theme and content of this expansion. The game narrative is told in four chapters of a story written by Nathan Morse. Gameplay comes with four new and different ways to expand upon and play the base game. You will play one versus many; completely cooperatively; or even solo if you wish, depending on the chapter. Included are four new and completely replayable ways to establish colonies On Mars!

For instance, here is the narrative that begins the first chapter and sets the stage for all of the following action:

Alert! Sensors show that aliens are invading the famous red planet! Long have the conspiracy theorists said this would happen. The threat to your mission is too high; you must take action. Will you be able to prevent the infectious spread of these beings determined on expanding to every habitable planet in the galaxy? Or will you play for the other side, a species trying to setup a colony on Mars, blithely oblivious to the danger their expansion represents, unaware that there are others out there eager to keep humans “where they belong” on Earth.

On Mars: Alien Invasion is a short story expansion to On Mars told over 4 chapters with 4 different modes of play.

The short story is titled Alien Invasion and contemplates the following Chapters and modes of play:

• Chapter 1 - Invasion - 1 vs All - 3 to 5 players
• Chapter 2 - Outbreak - Co-Op - 2 to 4 players
• Chapter 3 - Blackout - Co-Op - 2 to 4 players
• Chapter 4 - Monolith - Solo - 1 player