The Post Terran Minerals Corporation looks for clues to threats they have received at the bottom of the oceans of Europa. You are sent into Storage Depot G-22 nearby to create a diversion.

After an encounter with another mercenary, the operation backfires, with barely enough data transmitted back to PTMC to render it a success. It is revealed that PTMC has been threatened with destruction by an ex-member of the Extra-Solar Natural Resources Corporation, and PTMC wants to find the weapon fast. You are sent to Essonapri Mine, built around an underground river network on a grey, beaten planet.

The second of two possible locations for ESNR's weapon, the sewer networks in Serduta Munitions Bunker have lately gone berserk. A purging operation is in order.

Two weeks later, and PTMC calls back to say it's not over yet. The Collective Earth Defense is undergoing a joint operation with PTMC to resolve an infected training ground. In the end the best solution is to blow the place up, and you are sent in to do the job. Meanwhile PTMC downloads the entire Chac'shir Verahn database without CED knowledge.

You are sent to the base camp for the anti-ESNR mission on Shaol, where you learn that PTMC is beginning to play dirty. Suddenly, robots from a nearby ESNR mine on Mount Tefoleg bomb the PTMC installation in retaliation for PTMC's attacks. You are sent to the mine to halt the bombing.

The PTMC facility has been severely damaged but still stands. PTMC, suspecting that ESNR's weapon is not yet complete, sends you to Alarlof Kiln, ESNR's largest smelting facility, to severely delay the construction.

Imprisoned PTMC operatives have been located in Cefispar Mine, 2000 kilometers from the PTMC base camp. You are sent in to rescue them, when an unknown voice warns to to back off. Undaunted, you proceed into the mine.

When contacting PTMC before heading home, you find that when you let the prisoners on board, you also gave someone access to your ship's computer. Your warp core activates and you turn up in hell.

Ganesh Dungeon is no more, but when you head out the escape tunnel you only end up in "Level Two".

After breaking through a rock wall, you are finally free of the dungeons. PTMC cruisers meet you above the surface, where you learn that the dungeons had nothing to do with ESNR. Suddenly a transport appears and deploys thousands of mechs, which proceed to assault the cruisers. You are warped out of the area, later learning that only one of the three cruisers survived the attack. You then search for the source of the transmission you received while entering Cefispar Mine, and warp to a volcanic planet with a small mine.

Firehand Basin turns out to be a mistake, with all evidence on the planet being erased. Back on the base camp at Shaol, you learn that the weapon that PTMC fears does not belong to ESNR, but rather a radical group known as the Impetus of Justice. ESNR is merely looking for the weapon, quite probably with the intent of using it on PTMC.

Three days later, PTMC has isolated the location of the weapon, code named "Apocalyptic Factor", to a system three thousand light years from Earth. Unfortunately there is a shield surrounding the system, making it impossible to break through. The PTMC fleet enters the system to look for a device to break through the shield. During the scan, a mech spawner in the asteroid belt begins to hassle the fleet, and you are sent into the asteroid to deactivate it.

As soon as you leave the asteroid, the PTMC fleet seems to be up to something. They are following a mech equipped with a blocker for the shield, but they are not fast enough. The robot learns, however, that it has lost the advantage of speed with your Pyro in pursuit and dives straight into another asteroid, though it doesn't completely disintegrate. It is impossible to travel down the small hole left by the robot, so you have to find another way to the blocker.

Ursula Asteroid was a trap, but you have the blocker nonetheless. You head through the shield to its source on Cilean, in a bid to deactivate it.

The shield is down, and all hell breaks loose. The PTMC warships engage the power core on Dordach, dealing heavy damage. The IJ's turrets fight back, also dealing heavy damage and destroying a PTMC cruiser. The ESNR then arrive on the scene and start to bombard both sides, but the PTMC and IJ forces endure the onslaught. You are sent to Dordach to cut the power to the Apocalyptic Factor and stop them once and for all.

The Impetus of Justice has taken a massive blow and the ESNR forces have retreated after a crushing defeat. However, the final gambit of the IJ, the Apocalyptic Factor itself, is already operational and headed dead toward the PTMC Shiva Station...