Although based on the second film, the game's story is a sequel to the Alien trilogy, set 23 years after the original films. The player assumes the role of a Colonial Marine on board the UAS Endeavor, a spaceship tasked with responding to a distress call from the outer colonies. The game has seven character classes: Gunner, Demolisher, Technician, Doc, Phalanx, Lancer and Recon. The game contains four-story campaigns with three missions each, and the player is accompanied by two allies who can be controlled by another player or by an AI. There are five levels of difficulty and twenty types of enemies, and weapon customization and character progression are present within the game. Local co-op is not available, though online matchmaking can be public or private. There are plans for post-launch DLC, but there are no loot boxes or microtransactions.
The gameplay seen in the reveal trailer and in a hands-off demo has been compared to the Left 4 Dead duology.