Preemptive strikeIn March 2153, acting on intelligence provided by the Guardians, the Xindi launched a surprise attack on Earth. The Xindi, who had been without a homeworld since the 2030s, had been informed by their protectors that in the 26th century humanity was going to destroy their new homeworld. Because of this, the Xindi-Primate scientist (and Xindi Council member) Degra had been working on a superweapon capable of destroying an entire planet for several years. (ENT: "The Expanse", "The Xindi" "Azati Prime", "The Council")
It was the first prototype of the weapon, a small one-man vessel crewed by a Xindi-Reptilian warrior, that carried out the attack on Earth. It utilized a powerful force beam to carve a swath of destruction from Florida to Venezuela, killing seven million people. The vessel subsequently self-destructed; portions of this probe were recovered by a Vulcan ship in Central Asia, due to an undetonated charge in the vessel's engine. (ENT: "The Expanse", "Azati Prime")
As a result of this attack, the Earth Starfleet recalled the NX-01 Enterprise, which was currently on a deep-space exploration mission in the Beta Quadrant. The tragedy on Earth was of a personal nature to one of Enterprise's crew; Commander Charles Tucker III's sister Elizabeth was killed in the attack. (ENT: "The Expanse")
Knowledge from the future
On the way back to Earth, however, Enterprise was intercepted by a Suliban Cabal fleet. Suliban soldiers borded Enterprise and seized Captain Jonathan Archer from the bridge, transporting him to see Silik, the head of the Cabal. Archer initially suspected Silik may have had something to do with the attack, but Silik took Archer to the temporal communications chamber to talk with his master from the future.
The Suliban benefactor told Archer that Earth had been attacked by the Xindi, operating on behalf of a new faction in the Temporal Cold War. He told Archer the reason for the attack: humanity was going to destroy the Xindi homeworld in the 26th century, and they wanted to stop this from happening. To do so, they were constructing a much larger superweapon capable of destroying all of Earth. He also gave Archer a set of coordinates, telling him the Xindi would be found there. Archer was exteremely skeptical, but the mysterious figure told Archer to quantum-date the wreckage of the probe. After this, the Suliban returned Archer to his place on Enterprise.
Enterprise returned to Earth on April 24, 2153, where it was greeted by Captain Carlos Ramirez and Intrepid. Once at Starfleet Command, Archer relayed the tale the Suliban benefactor had told him. Admiral Maxwell Forrest and Vulcan ambassador Soval were initially skeptical, but Archer proved at least part of the mysterious figure's story by showing a portion of the probe had been built in 2573.
Soval remained unconvinced. He revealed to Archer that the coordinates he had been given were those of the Delphic Expanse, a dangerous region of space. Trying to stop Archer from proceeding with his mission, he showed him footage from the Vulcan starship Vaankara. Archer and Forrest were unswayed by Soval, however, and Forrest authorized Enterprise's new mission. (ENT: "The Expanse")
The new mission begins
In preparation for its new mission, Enterprise was heavily upgraded. A new weapon developed during the ship's journey of exploration, the photonic torpedo, was added to its arsenal. A new command center was installed, replacing a storage bay for conduit housings. This center possessed an advanced computer system for coordinating any information Enterprise might find on the Xindi. An upgrade to the universal translator was also installed. (ENT: "The Expanse", "The Xindi")
Nine members of the crew opted to leave the ship before its new mission, though none of the senior staff did, not even Doctor Phlox, a Denobulan, or Subcommander T'Pol, a Vulcan, despite the fact that this mission supposedly did not directly concern them. T'Pol, in fact, was forced to resign from the Vulcan military in order to accompany Enterprise, as the Vulcan High Command had ordered her to return to Vulcan rather than accompany Enterprise into the Expanse. (ENT: "The Expanse")A significant addition to the crew was provided by General Casey at the request of Archer: a full contingent of Earth's most elite ground forces, the Military Assault Command Operations group (the MACOs). Enterprise's contingent was commanded by Major J. Hayes. Enterprise chief armory officer Lieutenant Malcolm Reed greatly resented the presence of the MACOs, believing that the need for this "extra muscle" reflected poorly on his security staff. (ENT: "The Expanse", "The Xindi")
Early days in the Expanse
It took Enterprise six weeks to travel from Earth to the Expanse (the ship arrived in August), and even then six more weeks passed while the ship began to fruitlessly comb the Expanse for any reference to the Xindi. The crew turned up only one lead: a freighter captain who had once taken a Xindi passenger to a trellium mining planet. During this time, Enterprise had its first encounter with the mysterious spatial anomalies that pepper the Expanse. (ENT: "The Expanse", "The Xindi")Enterprise arrived at the trellium mine in September. Captain Archer bartered with the mine's foreman and was permitted to see the Xindi Kessick in exchange for a quantity of liquefied platinum. Kessick, however, did not match the genetic reconstruction of what the corpose recovered from the probe might have looked like originally. Kessick was a Xindi-Primate; one of what he revealed to be five species of Xindi. Phlox determined that the different Xindi races shared over 99.5% percent of their functionally important DNA, making them more similar than humans and chimpanzees.
Kessick was killed during while trying to help Archer and Tucker escape the mine (they were rescued by the MACOs), but with his dying words he managed to communicate the coordinates of the Xindi homeworld. Arriving at the coordinates, however, Enterprise found nothing more than a debris field; the planet had been destroyed approximately 120 years ago. With no further leads at that point, Enterprise set a course for deeper into the Expanse. (ENT: "The Xindi")Enterprise next entered the Orassin distortion field, where it began to experience ever-increasing amounts of anomalies. After being incapacitated by one, Enterprise was boarded by Osaarian pirates, who raided the vessel for valuable supplies. Following the trail of the Osaarian ship, Enterprise discovered a massive cloaked sphere generating waves of gravimetric energy; it was this sphere that was responsible for all the anomalies nearby. Enterprise managed to recover its missing valuables from a cache inside the sphere. It also managed to download a Xindi database from the Osaarians, who had in turn acquired it from a Xindi-Arboreal ship they had pirated. (ENT: "The Xindi", "Anomaly")
Enterprise followed the trail of the ship in the database as far as the Loque'ueque homeworld, but turned up no useful information. Shortly thereafter, Enterprise stopped at a deuterium station on Norellus, where Captain Archer spoke to a V'radian chemist named B'Rat Ud. Archer had learned from the Osaarians that the mineral trellium-D could be used for protection against the anomalies in the Expanse, and was interested in acquiring some for Enterprise. Archer arranged to rendezvous with B'Rat at his shop on the Xanthan homeworld in a few days. (ENT: "Anomaly", "Extinction", "Rajiin")
First encounters with the XindiArriving at the Xanthan bazaar, Commander Tucker acquired the formula for synthesizing trellium-D from B'Rat in exchange for spices from Chef's galley. While Archer was at the bazaar, he was accosted by a dealer in sex-slaves named Zjod. Archer refused to buy any, but as he left, one of them (Rajiin) ran after him, and Archer assisted in her escape. Archer offered to transport Rajiin to her home planet of Oran'taku, but she abused his hospitality, taking biometric scans of many of the crew using her telepathic abilities.
When Archer realized what she was doing, he had her locked in the brig, an action which precipitated Enterprise's first encounter with the Xindi. Two Xindi-Reptilian ships attacked Enterprise, and a strike team from one boarded the ship and recovered Rajiin despite a valiant defense by the MACOs. It turned out that Rajiin was a Xindi plant, compiling information so the Xindi could build a bioweapon as an alternate method of destroying humanity. (ENT: "Rajiin")
Enterprise continued deeper into the Expanse, still searching for a way to a acquire trellium-D, as B'Rat Ud's directions had proved useless. The ship discovered a trellium asteroid field, and Commander Tucker and Ensign Travis Mayweather were successful in mining enough trellium to line the hull. However, the discovery of the Vulcan starship Seleya in the field showed that trellium causes Vulcans to undergo mental collapse; because of the threat to T'Pol, Archer elected not to line Enterprise's hull with trellium and had the material placed in a biohazard locker. Later on, however, the hull of Shuttlepod 1 would be lined with trellium to enable it to take detailed scans of spheres. (ENT: "Rajiin", "Impulse", "Exile")Following a tip from the telepath Tarquin, Enterprise arrived at a Xindi-Arboreal colony in October. This colony was home to a kemocite refining facility run by Gralik Durr; the kemocite mined here had been used in the probe and in fact, Degra was shortly to visit the colony to pick up his final shipment. Archer explained the situation to Gralik, who was shocked that his people would try to destroy a planet after what had happened to Xindus; he told Archer of the sixth Xindi species, the Avians. Gralik sabotaged the kemocite shipment, and T'Pol and Hoshi Sato altered a canister's radiolytic signature to allow Enterprise to track it. (ENT: "Exile", "The Shipment")
Visit to 2004
In November 2153 (after Enterprise had encounters with a lost human tribe and a polaric field), Captain Archer was once again contacted by "Crewman" Daniels, an operative in the Temporal Cold War who had assisted Enterprise on a couple of previous occasions. Daniels informed Archer that the Xindi attack on Earth was the result of a temporal incursion whose effects had not yet reached his own time, so he would be unable to assist in the search for the superweapon. (ENT: "North Star", "Similitude", "Carpenter Street")
Daniels did, however, bring word that three Xindi were present in the year 2004 on Earth, where they had been operating for two months. Daniels sent Archer and T'Pol backwards in time to deal with the threat. Archer and T'Pol discovered that Xindi-Reptilian scientists were assembling a bioweapon to wipe out humanity in the past; later information would show that after the Rajiin incident the Xindi Council had banned further research into the bioweapon and that the Guardians had taken the biologist Damron and his team into the past to covertly complete their work. Archer and T'Pol successfully stopped the bioweapon from being deployed and returned to 2004. (ENT: "Carpenter Street", "The Forgotten")
At the Calindra systemIn December, Enterprise finally managed to reacquire the radiolytic signature of Gralik's kemocite shipment. Degra was testing a second prototype in the Calindra system, but as Enterprise approached the location, it was nearly disabled by a dense anomaly field. Enterprise was rescued by the Kumari, an Andorian vessel under the commander of Shran. Shran pledged help in finding the weapon; when the Andorian Imperial Guard had heard of the attack on Earth, the Kumari had been dispatched to assist Enterprise and tracked the vessel through the Expanse with its faster warp drive. (ENT: "Proving Ground")
The Kumari and Enterprise (after witnessing a failed test of the weapon; the failure no doubt caused by the sabotaged kemocite) were able to work together to steal the prototype weapon. The Andorians attempted to make off with it for themselves for use as a deterrent in their conflict with the Vulcans, but Captain Archer triggered its self-destruct rather than let the Andorians keep it. The Kumari subsequently returned to Andoria, but Enterprise remained in the system to investigate further. Degra's ship was detected in the system, examining the effects of the test, and he and his assistants were captured by Enterprise personnel. (ENT: "Proving Ground", "Stratagem")
Doctor Phlox wiped Degra's memories and through an elaborate subterfuge, Archer was able to convice Degra that the two had spent years together in a Xindi-Insectoid prison after the destruction of Earth. Archer managed to get Degra to reveal the coordinates of the Azati Prime system, where the weapon was being built. Degra and his assistants were placed back on their ship, their memories wiped again, and none of them the wiser that anything had ever happened. (ENT: "Stratagem")
Journey to Azati Prime
Enterprise's journey to Azati Prime took some time, as the Earth vessel was of course not equipped with the subspace corridors Xindi vessels used to move quickly across the Expanse. During this journey, Enterprise discovered a mysterious alien adrift in a small pod in a transdimensional disturbance; the crew quickly discovered he was somehow related to the builders of the spheres. The alien was dying as he could not survive in the conditions of our universe. (ENT: "Harbinger")
Back in November, Enterprise had encountered a species called the Triannons who worshipped the Makers of the spheres. They claimed that the Makers were using the spheres and the anomalies they generated to reshape the Expanse; given the discovery of this "test subject," it appeared that the Triannons had been partially right. The alien attempted to sabotage Enterprise before disintegrating entirely; before he did, he revealed a link between the Xindi and the Sphere Builders, claiming his people would triumph when Earth was destroyed. (ENT: "Chosen Realm", "Harbinger")
Enterprise negotiated another transdimensional disturbance in January; afterwards it came upon the crash site of a Xindi-Insectoid ship. The crew recovered a shuttle from the wreckage; it was brought into Enterprise's launch bay. (ENT: "Doctor's Orders", "Hatchery")
Showdown with the XindiIn February 2154, Enterprise at long last slipped into the outskirts of the Azati Prime system, behind a planetoid. Using the stolen Insectoid shuttle, Tucker and Mayweather were able to determine that the superweapon was being built underwater on Azati Prime. Captain Archer concocted a plan to destroy it: he would take the Insectoid shuttle in, loaded with photonic torpedoes, and blow it up.
Before he could do this, however, Daniels returned, whisking Archer away to the Battle of Procyon V aboard the Enterprise-J in the 26th century. He revealed that at this time the Sphere Builders were making a push to invade the Milky Way Galaxy, but at this battle the forces of the United Federation of Planets defeated them, pushing them back into their transdimensional realm. The Sphere Builders forsaw that these events would occur, which is why they were attempting to manipulate the Xindi into destroying Earth: no Earth, no Federation.
Daniels tried to persuade Archer not to go forward with his plan, but rather pursue a diplomatic solution, as the Xindi needed to be at peace with humanity for in the future they were Federation members. Archer was not persuaded; he went ahead with his plan anyway and was captured by security forces under the command of Councilor Dolim. Archer, using information he had acquired during his subterfuge at Calindra, secured an audience with Degra and managed to communicate Daniels' story. (ENT: "Azati Prime")Meanwhile, Enterprise came under heavy attack by Xindi forces, causing massive amounts of damage to the vessel. Fortunately, Degra managed to force the Xindi Council to order Dolim to call off the attack, and he secured the return of Archer to his ship, arranging a secret rendezvous in three day's time so Archer could show him evidence that the Xindi were being manipulated by the Sphere Builders. (ENT: "Azati Prime", "Damage")
Unfortunately, the ship's warp coil had been damaged during the attack, rendering the ship unable to travel at warp speeds. It would never be able to reach the rendezvous in time. Enterprise was assisted in its repair efforts by an Illyrian vessel that had been disabled by an anomaly field; Enterprise helped the Illyrians in turn. They were unwilling, however, to part with their warp coil because not having it would mean a three-year journey home. Believing the rendezvous with Degra neccessary to the survival of humanity, Archer and the MACOs boarded the Illyrian craft and stole their warp coil. (ENT: "Damage")
Convincing the Council
Enterprise rendezvoused with Degra as well as Arboreal councilor Jannar behind the cloaking barrier of the sphere, where Archer showed them evidence of the Guardians' treachery: the bioweapon recovered from 2004, the bodies of Damron and his associates, scans of the Sphere Builder test subject, the ship's database on the spheres, etc. Degra thought that Archer deserved a chance to bring his case before the Council and arranged a rendezvous on the other side of a subspace corridor in the Kovaalan nebula. Degra went so far as to destroy a Reptilian vessel trying to bring him back to the Council. (ENT: "The Forgotten")Enterprise traversed the corridor not without difficulty; the ship battled the Kovaalans and very nearly traveled to 2037, but eventually made it to the rendezvous early. Degra brought Archer before the Xindi Council, where he presented his case. The Arboreals and Primates were swayed, but the Reptilians and the Insectoids were so outraged by the presence of Archer that they walked out. Archer still needed the support of the Aquatics to obtain a delay on the superweapon launch; he obtained it when he persuaded Councilor Kiaphet Amman'sor to vote for it with a biometric hologram of the Sphere Builder test subject. However, an enraged Dolim murdered Degra and had the weapon stolen operating on instructions from a Sphere Builder who promised the Reptilians would be at the head of the Xindi in the future if they acted against Earth now. Dolim was assisted by the Insectoids. (ENT: "E²", "The Council")
Battle to save Earth
The weapon required launch codes from three of the five species to be armed; as he possessed only two of them, Dolim kidnapped Enterprise linguist Hoshi Sato and used Xindi neural parasites to force her to decrypt the third code. As the weapon could not arm while in flight, this delay allowed Archer to convene an alliance of Primates, Arboreals, and Aquatics to stop the weapon. Amman'sor promised her forces' support only when Archer promised Enterprise would try to disable the sphere network. (ENT: "The Council", "Countdown")
The combined assault team managed to destroy most of the superweapon's defensive forces, but thanks to Sphere Builder interference, the superweapon was able to enter a vortex for Earth, armed and ready, accompanied by a Reptilian and an Insectoid vessel. Hoshi Sato was rescued just before the weapon left, though Major Hayes died in the operation. (ENT: "Countdown")
The only ship capable of catching the superweapon in the vortex was Degra's, so Archer, Reed, Sato, Jannar, the other Xindi-Primate councilor, and a MACO strike team boarded the ship in pursuit. They caught up in Earth orbit, though not after the Xindi destroyed Yosemite 3 research post. Degra's lightly armed ship was no match for the Reptilian vessel guarding the weapon, however, and they could not get close enough to beam aboard. Luckily, Shran and the Kumari showed up at that moment to run interference for Degra's vessel; the Andorian ship had tracked them through the vortex. While the Kumari distracted Dolim, Archer and his team transported to the weapon. The MACOs killed all the Reptilians on board as Archer started the inversion sequence. Meanwhile, Dolim realized what the Kumari was doing and ordered his ship to return to the weapon. (ENT: "Countdown", "Zero Hour")
Archer's strike team transported back to Degra's ship, as Archer successfully overloaded the superweapon's reactor. However, a determined Commander Dolim transported to the weapon to reverse the damage. He engaged Archer in hand-to-hand combat as the weapon exploded around them. Meanwhile, the Kumari destroyed Dolim's vessel, leaving him with no way to get off. As the weapon continued to disintegrate, Archer placed an explosive charge on Dolim's back and blew him up. However, Archer was not able to transport off in time as the weapon exploded in Earth orbit. Degra's vessel returned to the Expanse to rendezvous with Enterprise. (ENT: "Zero Hour")
Meanwhile, Enterprise had been making good on Archer's promise to Amman'sor by using a deflector beam to damage one of the spheres' interspatial manifolds that allowed their subspace energy grid to hold together. Without energy, the spheres collaspsed in upon themselves, and the Expanse started to become normal space.
Enterprise met up with Degra's ship, and an Aquatic carrier returned Enterprise to Earth. However, as Enterprise approached Earth, it recieved no return signals from Starfleet. A shuttle sent down to San Francisco was attacked by P-51 Mustangs, a World War II fightercraft.