Need base game

Hungry for more Aliens: Colonial Marines? Purchase the Aliens: Colonial Marines Season Pass and get access to four downloadable content packages at a 33% discount! All add-on content packs are scheduled to be released from March through to summer 2013. The Aliens: Colonial Marines Season Pass will give you access to campaign content, additional multiplayer content, character customization and more!

If you purchase this Season Pass, all included content should be downloaded in-game and NOT from Steam, or you will be charged twice.