The Second Alien War was another devastating war between Humanity and a hostile alienkind that began several decades after the First Alien War. The alien aggressors, as well as X-Com, were sea-based in this war, and most conflicts took place underwater, with some land-based battles at terror sites.
After the Last War...Edit
The final battle of the First Alien War took place at the alien's main stronghold on Mars. The destruction of the Alien Brain had caused most of the Cydonian Base to self-destruct. With the alien's leader dead, the entire alien invasion armies suddenly died of unknown causes, possibly from losing an unknown psionic link or from a psionic kill signal sent upon the Alien Brain's death. With the alien homeworld lost, and the enemy army defeated, the human race was finally saved. X-Com was disbanded after their final victory at Cydonia, for they were no longer needed now that the war was over. All X-Com bases were dismantled or seized, and all remaining alien technology and Elerium was taken by the world governments.
However, not all was dead on Mars...
From the depths of the of the ruined alien stronghold, a powerful tachyon beam blasted forth and hurtled across space. After reaching Earth, it struck a dormant receptor upon an ancient alien structure. Deep within, hordes of sleeping aliens began to stir...
X-Com's Return: The War BeginsEdit
In the year 2040, reports of ships and planes being sunk by unidentified swimming objects(USOs) were running rampant. The new world factions knew that this was the work of aliens. In order to combat this new alien enemy, the X-Com was revived and put into action.
Early conflicts showed a host of new alien creatures and strange technologies and weapons. Such conflicts were against the Aquatoids, who were related to the Sectoids in the previous were, and Gillmen, aquatic sapient reptiles that were once an subspecies of mankind. The aliens used strange and powerful equipment and subs, such as the Zrbite-fueled Ion-Beam Accelerator engine and the stealthy Aquatoid/Human hybrid Deep One as terror weapons.
The Aliens' Power: The Ultimate ThreatEdit
Later in the war, X-Com now had a better understanding of the aliens. In fact, many of the enemies aren't even aliens. Some are mutated human slaves, some are extinct creatures from millions of years ago. It became apparent that the aliens were using a strange technology called "Molecular Control" to direct their forces. From implants hooked up to their brains, the aliens could use M.C to transfer and receive information, and some few could use it to exert control over X-Com Aquanauts. X-Com discovered that there were several ancient artifact sites across the sea that the aliens fervantly searched for. The sites contained powerful Synomium Devices capable of extending the Molecular Control net across the entire planet.
After many climactic clashes at Artifact Sites and undersea Alien Colonies, X-Com learned of their final primary objective. At a hidden location, which would later be found at a deep trench in the Gulf of Mexico, there was an alien city where they based all of their operations. The city, known as T'leth, also housed something even more powerful. At its deepest chamber, the remains of a godlike alien rest within a great re-animation chamber. The creature was housed in a stone coffin, and it greatly resembled the god monster Cthulhu.
At the point when X-Com had learned of T'leth, the war had escalated even further. By now the alien frontlines were reinforced with new alien troops. Tasoths, powerful lizard-like organic androids, disrupted the morale of X-Com Aquanauts with liberal use of Molecular Control. Hulking Lobster Men, giant lobster like sapients, tore through heavy onslaught with their nigh-impenetrable armored carapace and felled soldiers with deadly accuracy and brutal melee attacks with their crushing pincers. Terror attacks employed mixed crews of any two of the core alien races. New terror weapons were employed along with the earlier mentioned races, as well as some of the lesser races. Bio Drones provided air support with high-power sonic beams. Xarquids, giant mutated nautiloids, acted as weapons platforms using sonic disruptor cannon and particulate ink clouds. Dinosaur-like Triscenes ravaged coastal sites with twin sonic cannons and razor-sharp alloyed teeth.
Now X-Com had access to alien technologies, particularly Sonic Weaponry, Basic Molecular Control and Ion Powered Battle Suits. Using alien sub technologies, they completed their first two hybrid sub prototypes. The first, the Manta, was a fast and powerful fighter sub that outclassed the Barracuda. The other, the Hammerhead, acted as a fighter/transport. It could engage enemy subs and carry troops to a combat zone, but it is rather slow and not very effective in combat. They had also developed many reverse engineered weapon systems. The Displacer Hovertank, which used a magnetic field to hover on land and underwater, gave X-Com a significant edge on the battlefield. Special Molecular Control Implants given soldiers with the right build were trained to sabotage an alien's implant by using M.C. Disruptors. The Pulse Wave Torpedo, a powerful missile weapon based on the Disruptor Pulse Bomb, was developed for use as a deadly sub weapon.
The Last StandEdit
After successfully obtaining information from an Alien Colony, X-Com learned the location of T'leth. The city was at the bottom of a trench so deep that none of their current subs could reach it without being crushed by the extreme pressure. After extensive research in the fields of Alien Sub Technology, they had devised the ultimate replication of alien technology, the Leviathan. Similar to the Avenger Spacecraft, the Leviathan Fighter/Transport possessed the strength and holding space for a strike team large enough to besiege the alien city. X-Com proceeded to mustering such a strike team for the T'leth attack. They knew that, like the Cydoina Attack, the attack on T'leth would be a Do-or-Die Mission. The future of mankind would be decided by the strike team's success or failure. Once they were ready, the team boarded the Leviathan and blasted off to the final battle.
The T'leth Assault was divided into three sections. The first and second sections, the outer and inner city respectively, could be won by exterminating the aliens or by finding the lift to the next level. The city was defended by high rank aliens of every species minus the Gillmen. There were also hordes of aquatic terror units known as the Hallucinoids, a mutated ancient jellyfish that uses freezing attacks, and the Tentaculat, aliens that zombify aquanauts and impregnates said zombie with a Tentaculat Egg. The first two sections were built in the same designs as the of the Artifact Site and Alien Colony interior maps. The third section, the tomb of the Ultimate Alien, was the largest and longest of the three, for the strike team had to get through a long, claustrophobic passageway that spiraled inward to the Ultimate Alien's Re-Animation Chamber. Once they had reached the chamber, the team, battered and weary from combat, destroyed the power conduits keeping the alien alive. Knowing it was dying, the alien tried to save himself by raising T'leth. But it was for naught, because now that it had started to succumb to mortality, the M.C. Net was collapsing. Upon breaching the surface, the city self-destructed in a spectacular explosion, taking the alien and the X-Com strike team with it. The loss of the Molecular Control Network caused the alien armies to suddenly die, and all Zrbite had become inert.
Devastation and War AftermathEdit
T'leth's destruction in the skies above the Gulf of Mexico had caused a chain of devastating environmental changes. The explosion had released a massive cloud of toxic gas, which had killed off the populations of many cities near the Gulf. The great clouds of smoke and other gases had caused a great rise in the global temperature, and many environments once suitable for agriculture became fallow. Many years afterward, the leading global factions made several decisions that would be instrumental to mankind's survival. The first decision was to acquire Elerium, the power source used by the Cydonians. Zrbite had been proved an effective replacement for Elerium, but without Molecular Control, it was useless. Later on, several Elerium mines were established off planet. Second, they proposed the idea of a new city design that could house a great portion of the world population. The world governments worried about the costliness of such a city. Ultimately they agreed to this, and the first of the new cities, Megapol, was founded on the ruins of Toronto.