
- BGG rank
- BGG #16,945
- BGG rating
- 7.7
Chain Reaction 3.0
- 1–4 players
- 120 min
- Complexity 3.0/5
- 2009

Rules assistance for 5150: Illegal Aliens
Plain-language explanations of turns, card effects and disputed situations, with official source references and saved question history.

What would you like to know?
Answers come from the official rulebook, with the page to check.
5150: Illegal Aliens is an expansion for 5150 released in 2007 120 minutes per game. It was designed by Ed Teixeira and its main mechanics are Dice Rolling.
This is an expansion for the base game 5150. From the publisher's website: This book will introduce you to eight new aliens. Inside ILLEGAL ALIENS you will find complete descriptions for each of these alien races. These include pictures and the following information: Who these aliens are. Their current history. The type of Encounters they have. Their Prime Motivator. Their small unit organization. The Attributes they possess including new ones not previously mentioned in 5150. The weapons they use at squad level. Any available support weapons. What reinforcements are available. What type of vehicles they can utilize. And finally complete stats for their weapons. In addition we have included one scenario that introduces yet another new alien for a total of nine! This scenario features a new alien known simply as the "Night Terror". So without further adieu, let us introduce you to your new neighbors!
The listed playing time for 5150: Illegal Aliens is 120 minutes. This is the publisher’s estimate for a full game. The actual duration depends on the group, the player count and familiarity with the rules: first sessions usually run longer, while experienced groups often finish faster. Setup and teaching time are not included in this estimate.
5150: Illegal Aliens has a complexity rating of 2.0 out of 5 from BoardGameGeek players, which makes it a medium-light game. The rating reflects how much rules knowledge, planning and decision-making a typical game demands. Expect a longer first teach for heavier games, and use a preparation guide before game night.
5150: Illegal Aliens belongs to these categories: Wargame, Print & Play, and Dice. Its main mechanics are Dice Rolling. Categories describe the theme and setting of a game, while mechanics describe what players actually do on their turns. Each mechanic links to a catalogue hub with similar games, which helps when you want something comparable.
The credited designers of 5150: Illegal Aliens are: Ed Teixeira. These credits come from the published game data and name the people responsible for the game’s design, not its illustrators or publishers. Designer pages on MeepleRules collect other titles by the same designers, which helps when you enjoy a game and want to find similar ones.
The catalogue lists 5150: Illegal Aliens as an expansion for 5150. Expansions add new content, rules or scenarios to the base game and usually cannot be played on their own, so you need 5150 to use it. Check that your edition of 5150 is compatible, as some expansions were revised between editions.