This will need the Alien RPG core rulebook or the Starter Set to play.
Description from the publisher
Destroyer of Worlds is a complete Cinematic Scenario for the ALIEN roleplaying game, written by sci-fi novelist Andrew E.C. Gaska. In Destroyer of Worlds, players take the roles of Colonial Marines. The scenario is designed for 3–5 players plus the Game Mother, and it’s a gauntlet of one hell after another. Expect it to take three sessions to complete.
This boxed set contains:
• The main Destroyer of Worlds scenario book.
• A huge double-sided map (format 864x558mm) of Ariaricus colony on one side and the Fort Nebraska space elevator ground base on the other.
• Five pre-generated characters to play.
• Custom cards for weapons, vehicles, and personal agendas.
• Player maps and handouts.