A wonderful set of 'generic gribbly alien' rules to add to Future Combat games.
These rules do two important things in my mind;
1) They don't reinvent the wheel with new terms. If a Bio weapon functions in basically the same way as a weapon from the main rulebook then those rules are used. Terms like 'bio grenade' don't replace 'grenades'. Makes the expansion nice and consistent (and lean).
2) You can use these rules with pretty much any 'alien menace' miniatures in your collection. Instead of being too specific, the units are more like a 'template' for the size and type of monster you're adding to your force. Whatever models you want to use... these rules should let you get them in!
So if you're looking at adding some drooling, clicking, sneaking, murderous aliens to your games of Future Combat... this is well worth your cash.