"The invasion has begun and now stronger fighters have landed... Only the brave GD agents face this menace to save our planet!" The Elite Alien Army expansion enhances the game difficulty and the overall game experience by combining the Galaxy Defenders core set elements with these new aliens. This expansion may be integrated into any Galaxy Defenders mission to enhance the challenge, by either replacing an entire alien color rank or simply by following the campaign enhancements detailed in the Rules Booklet. This is not a complete game, a copy of the Galaxy Defenders core set is required to play.