- colonial marines crash land onto the surface near Hadley's Hope on the moon Ancheron LV-426
- your rescue team arrives 17 weeks after the atmospheric processor exploded
- references to the movies, such as the APC vehicle Ridley drove, and a new android Bishop (voiced by Lance Henriksen) accompanying your party
- begin setting up motion sensors and one of them is knocked out by some Xenomorph aliens
- aliens appear from all directions and begin their assault on your tea
- later in the game, board the USS Sulaco
- start out at the bridge of the Sulac
- a hull breach is imminent
- the player has to dislodge a bullet that held a door open
- you'll encounter employees of the Weyland-Yutani Corporation, who are enemies
- Lance Henriksen will also be voicing Weyland
- Marines can earn experience in both single and multiplayer
- Marines and Xenomorphs have different upgrade paths
- experience earned as a Marine won't count towards developing your Alien
- Xenos are playable only in multiplayer