There are several campaigns in Earthfall, each unraveling a different part of the story. Each is divided into several chapters.
Invasive Species
Supply Run
Breakdown
The group's vehicle has broken down and they are forced to take shelter in an abandoned gas station garage. The objectives include searching for items to prep an exterminator van for escape such as looking for a wheel, gas, and a battery, all the while being attacked and besieged by the alien threat.