2006 · ソースブック（プレイを拡張するルール／オプション）
Alien Invasion
This roleplaying sourcebook explores alien visitations, abductions, government conspiracies, military projects, cults, and other fringe phenomena. It provides material for campaigns centered on investigating alleged extraterrestrial activity, including rules for abductions and the effects of crop circles. The book includes new character backgrounds and advanced classes, feats, alien technology, cults, military installations, new aliens, and creature templates such as the Horlock. It also examines purported projects including Majestic 12, Project Blue Book, Excalibur, Looking Glass, and Moondust.
スキルベース（スキルを購入または獲得）属性／ステータス制（STR、CON、PERなど）レベル制（XPを獲得してレベルアップ）
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。