Aliens: Eradication, by Kontra_Kommando, transforms classic Doom into Aliens. But with the addition of xenomorphic sprites, character classes, and even new systems such as deployable autoturrets, it's more than just Doom. If you've played the PlayStation shooter Alien Trilogy, you'll notice that this conversion borrows some of its enemies and weapons.

The classes and how they change the way the game plays are the most intriguing aspects of this title. As a settler, you can recruit and command fellow settlers you encounter, but you are especially vulnerable to surprise attacks by facehuggers. Even in pixel form, they are terrifying.

Mercenaries, on the other hand, are heavily armed and accustomed to combat, much like the Marines in the movies. I like that the creators of this mod did not resist the urge to make the Colonial Marine one of the classes.

Other classes include the Artificial Man, who have missions where their batteries run low and must be recharged using generators. Weyland-Yutani operatives also have the latest high-tech armor and weapons, but can be damaged by the acid blood of damaged deformities.

The mod also features several types of enemies, including old friends, xenomorphs, and malfunctioning synths and predators. [Aliens: Eradication can be downloaded from the mod DB.