In Galaxy Defenders, each player takes control of one or more agents with unique powers, trying to defend the planet from an alien invasion. The battle for Earth against the aliens develops in a series of missions organized in a story-driven campaign. The battle for Earth against the aliens develops in a series of missions organized in a story-driven campaign.

Missions are based on modular maps designed by "0onegame" and are played over a variable number of rounds. Each mission may have multiple endings and the outcome of any mission will change the flow of the story.

The battle will be carried on round after round; each player will play in sequence his agent turn and then, one aliens turn. after that, the game will pass to the event phase that will bring the players to the next round.

The agents will gain experience during the missions and this experience can be used to transform a good soldier into a perfect galaxy defenders agent with multiple skills, basic and improved tactics and the ability to use new devices, advanced human weapons and alien technology.

The core game features 23 high-detailed miniatures, modular maps, custom dices, agent profile sheets, event, alien and closed-encounter cards and much more.