Weyland-Yutani has seceded from all nations of Terra and has declared itself a colonial power. Their first act was lightning strikes on US Space Command outposts in their "home sector". You are a member of the Marine Space Force, Eridani and have been called up to strike back. Your target is a WY corporate outpost on Thetis. Located there are some prime WY Execs that need to be captured at all costs. Warnings of a new bioweapon have been issued.