2003 · ソースブック（プレイを拡張するルール／オプション）
Invasion of Monster Island
Alien invaders attack Earth with flying saucers, battle robots, and landing parties, while giant monsters and human military units fight to defend the planet. This expansion adds rules for battling invaders, new monster powers, military units, and kaiju, along with scenarios set in outer space and on other worlds. It also includes an alien-invasion filmography and quotations. The base game and its first expansion are required to use it.
ゲーム情報（人数、プレイ時間、対象年齢、クレジット）の出典：BoardGameGeek。