Location:
Nye County, Nevada, USA

Background:
The GDF have captured a Strogg Slipgate and are testing it underground. The Strogg must destroy this captured Slipgate before the GDF can uncover its secrets.

Location:
Sogn og Fjordance county, Vestandett. Norway

Background:
The remote research station known as The Ark has made a breakthrough in analyzing Strogg biotechnology. The Strogg must destroy the lab equipment in the underground laboratory before their secrets are made public.

Location:
Kings Canyon, Northern Territory, Australia

Background:
The Strogg have taken over an abandoned fortified base to develop an improved Stroggifier. The GDF must fight their way down the canyon and destroy the Stroggifier before it can be used to produce new armies of Stroggtroppers.

Location:
Reservation Island, South Atlantic

Background:
Moore Observatory is the only surviving facility which still holds data on the appearance of the first Strogg Slipgate. The GDF must recover this DataDisc and get it to the Transmitter for the awaiting GDF scientists.

Location:
New Jersey, USA

Background:
The Strogg have deployed a high-ranking DataBrain to oversee the construction of a new major facility. The GDF must crack the Strogg defenses, steal the DataBrain and take it to the transmitter for analysis by GDF High Command.

Location:
Lake District, England

Background:
The GDF have forced the Strogg ship to crash-land in a Quarry. The Ship´s auto-destruct has failed, and the Strogg must power it up with three energy cells to prevent the GDF from learning the secrets of deep space travel.

Location:
Khartown, outskirts, Sudan, North Africa

Background:
The Strogg have adapted a North African oil refinery to Stroyent production and are converting the GDF´s strategic fuel reserves for their own use. The GDF must fight their way through the Strogg defenses and destroy both North and South Stroyent filters to permanently halt the refinery´s Stroyent production.

Location:
Lapland, Finland

Background:
The GDF are salvaging Strogg technology and are about to transport it on an underground train network. The Strogg must destroy the GDF-salvaged equipment on the train before it can be removed for analysis and reproduction.

Location:
Miura Peninsula, Kanagawa, Japan

Background:
The Strogg have infested the mammoth underground sewer network leading from the urban districts to the rural coast. A GDF task force must break through and override the sewer controls to flush the Strogg out before sections of the city are overrun.

Location:
Algeria, North Africa and Vinson Nassif, Ellsworth

Background:
The GDF have located the presence of a Strogg Slipgate in a remote North African valley. The GDF must hack the Slipgate controls and travel through it to destroy the Strogg Nexus Tower in Antarctica. The Strogg must destroy and delay the GDF forces, defending the Nexus Tower until reinforcements arrive.

Location:
Yosemite Valley, California, USA

Background:
The Strogg are using a Contaminator device to infect the region´s water supply. The GDF must destroy it, or let the Strogg turn the local population into mindless zombies.

Location:
Whakaari/White Island, Bay of Plenty, New Zealand

Background:
The GDF are using the outlying geothermal facility to create an atmospheric EMP weapon with which to drive the Strogg out of Earth´s orbit and halt the invasion. The Strogg must destroy the geothermal energy core to prevent the GDF from disabling their fleet.