Seven of Nine

Seven of Nine (real name Annika Hansen) is one of the main crew members of the sci-fi TV show, Star Trek: Voyager. She was introduced into the show during the season four premiere episode, Scorpion Part Two. She was once a Borg drone, but was liberated from the Borg Collective by the Voyager crew during the Species 8472 conflict. Since joining the Voyager crew, Seven has managed to re-establish her humanity and form a new identity for herself, and at the same time has provided Voyager a wellspring of knowledge on the Borg.
She was portrayed by German-born American actress Jeri Ryan.
==History==
===Early Life and Assimilation===
Seven of Nine was born to parents Magnus and Erin Hansen. She was given the birthname, Annika Hansen. Her parents were exobiologists (they studied non-human or alien organisms) who studied a then-unknown species known as the Borg. When Annika was 4, they took her along with her for a long-term scientific mission aboard their ship the USS Raven. For a couple of years, their research had gone without incident.
They had found and followed a Borg cube to the Delta Quadrant. They had invented a form of multi-adaptive shielding which prevented them from being detected. However, after they encountering an ion storm, the Raven was damaged and their shielding failed, leaving them visible to Borg sensors. The Borg cube detected the small ship and intercepted, chasing it down to a barren planet. The ship crashed but the Hansens survived, only to be assimilated by the Borg.
===Serving the Collective===
As a child, Annika did not go through the same manner of assimilation as adults do. After watching the transformation of her parents, she was placed inside a maturation chamber - a device that would accelerate her physical development. She remained inside the maturation chamber for five years, and as her body grew, the Borg reconstructed her neural pathways and purged her of any trace of individuality. After emerging from her maturation cycle, she was no longer the human called Annika Hansen. Her new designation was Seven of Nine, Tertiary Adjunct of Unimatrix 01. Over the next thirteen years, she would contribute to the Collective's destructive pursuit of perfection by killing and assimilating countless innocent victims.
===The Species 8472 Conflict===
When the Borg became engrossed in a one-sided war against Species 8472, they forged an alliance with the lone Federation starship Voyager, whose crew had access to knowledge that could turn the tide in the Collective's favor. As part of the agreement, the Borg selected a representative drone to communicate and work directly with Captain Janeway and her officers. Seven of Nine was selected as the representative and aided Janeway's efforts into modifying the Borg's nanoprobes to build a bio-molecular warhead that could kill Species 8472. As they worked together, Janeway noticed that her drone liaison appeared to have been human, which Seven of Nine confirmed.
Species 8472 would later attack the cube escorting Voyager through Borg space. The Collective deemed it necessary to sacrifice their ship to protect Voyager, and so rammed into the alien bioship, destroying both vessels. Seven of Nine and the rest of her ship's subjunction transported aboard Voyager just before impact, bringing with them an injured Captain Janeway and Lieutenant Tuvok. The drones assimilated one of Voyager's cargo bays and converted it into a workspace to continue working on the nano-warhead. As Voyager continued its journey, the war raged on with Species 8472 advancing towards the Borg's core worlds. The Collective decided that they must comandeer Voyager and take it into the aliens' realm to bring the fight to them. Seven of Nine accessed Voyager's deflector dish and reconfigured it to emit an inverse graviton beam that would create a quantum singularity: a gateway into Species 8472's homespace. Commander Chakotay had threatened the Borg with decompression if they attempted any kind of sabotage and so he had the entire deck depressurized and blew the drones out into space. Seven of Nine managed to survive the decompression, however, and later revealed the truth: that the Borg had started the war by invading Species 8472's fluidic realm. She then continued to assist with modifying Voyager to battle the aliens and recreated the anomaly that brought Voyager into fluidic space, allowing them to return to the Delta Quadrant.
The nanoprobe warheads successfully destroyed a number of alien bioships, which deterred Species 8472 and sent them fleeing back to their own realm. Seven of Nine then regained contact with the Borg Collective, which ordered the assimilation of Voyager. She attempted to hijack the ship and fly it back into Borg territory, but was stopped by Chakotay, who used a neural tranciever connected to a Borg alcove in Cargo Bay 2 to telepathically communicate with the drone. He saw Seven's memories from her human life and maintained the psychic link long enough for B'Elanna Torres to transmit an energy surge through the alcove, overloading Chakotay's tranciever while he was connected to Seven. The backlash overloaded Seven's neural tranciever implants and forcibly severed her connection to the Collective.
===Becoming human===
Shortly after being severed from the Collective, Seven of Nine's human cells began reasserting themselves. As her immune system increased in strength, her body began to reject her Borg implants, thus threatening her life. Captain Janeway had no intention of returning her to the Borg and decided that she was to remain on Voyager and assist the crew with dismantling the modifications the Borg had made to the ship during the battle against Species 8472. Seven helped, but reluctantly, making several attempts to escape custody and contact the Collective. Eventually the Borg modifications were destroyed and most of Seven's implants had been removed from her body, which appeared slender and quite attractive without any Borg exo-plating. Captain Janeway and the Doctor would continuously monitor Seven's human development from hereon in.
Even though Seven had had her implants removed, she initially still acted in a very Borg-like manner. She would come across as cold, distant and often outright hostile. She would frequently come into conflict with Captain Janeway regarding ship procedures and Starfleet protocols, as well as basic human morals and behavior. These factors made it very difficult for her to interact with the crew, and so the Doctor would provide her lessons in social development. Over the course of her life on Voyager, Seven would learn how to properly converse with others, how to smile, even how to enjoy herself.
Even as she developed her sense of human individuality, Seven still clung to certain aspects of her life among the Borg. Some of her implants remained, including non-essential devices such as her assimilation tubules. She also never used her human name, preferring to go by "Seven". Though she had turned her back on the Collective, she continued to draw strength from the sense of order they had instilled in her. Seven possesses a highly analytical mind and always tries to put it to good use, preferring to bury herself in work rather than relax or socialize. Her main duties aboard Voyager - despite having no Starfleet rank - included running the ship's astrometrics lab, navigating the ship and offering information and insight on the Borg whenever Voyager was forced to engage them.
Seven's recovery would not be easy. It took her years to adjust to being an individual. However she proved to be an invaluable member of the Voyager crew. As she advanced her social skills, she would also develop a romantic interest in Commander Chakotay.
=== Helping Picard ===
Seven of Nine appeared in Star Trek: Picard as a supporting character.
Near the end of the third and final season, Picard and his former command crew of the USS Enterprise-D and USS Enterprise-E discovered that a group of rogue Changelings who sought revenge for the events of the Dominion War had allied with the Federation's worst enemy, the Borg, who were presumed no longer a threat thanks to the virus that they had been infected with by Kathryn Janeway, former captain of the USS Voyager. Initially, the Changelings and their leader, Vadic, were able to take over the USS Titan-A with some help from Lore, Data's evil twin brother, after pursuing it for some time in their ship, the Shrike, and causing some damage, but Data was able to bluff Lore into performing a move that essentially allowed Data to override Lore in their new body of Daystrom Android M-5-10 and take over, in which he single-handedly took out Vadic's forces using the Titan systems against them, with a little help from Worf and Raffi Musiker, before then having Vadic and her remaining bodyguard sucked out of the Titan bridge via the emergency airlock, while Seven and Jack were safe thanks to a force field Jack deployed to protect them from the vacuum, though Seven still got one last taunt in at Vadic before she met her end...
After destroying Vadic, her forces, and the Shrike, Seven then helps take Picard and his old command crew back to Earth after discovering that the Changelings had infected the transport system Starfleet uses with Borg DNA taken from Picard's original deceased body he still possessed from his time as Locutus, and to warn Fleet Admiral Elizabeth Shelby, who was in the middle of Frontier Day celebrations with having the USS Enterprise-F and the rest of Starfleet be united in the new Fleet Formation protocol (which unknown to Shelby was another move by Vadic's forces to put Starfleet under the Borg Queen's control). By the time Picard can warn her of the Borg having returned, alarming Shelby at the mention of the Federation's most feared foe after she witnessed the carnage of the Battle of Wolf 359 years ago, it is too late. After Picard's son Jack becomes Vox of Borg, the voice of the Borg Collective, and Locutus' successor, every Starfleet crew member below the age of 25 is assimilated by the Borg DNA in their bodies into becoming loyal Borg Drones to the Borg Queen, and set about killing Shelby and every Starfleet crew member not assimilated, before turning the fleet on Spacedock to take down the Earth's planetary shield and then bombard the major cities as part of the Borg Queen's genocidal intent to wipe out all species while using her new assimilated drones to rebuild the Borg through evolution rather than assimilation. Seven's own captain, Liam Shaw, is also mortally wounded by the assimilated Sidney and Alandra LaForge and his other younger crewmembers, but with his last order, passes command of the Titan to her, before expiring.
While Picard and his crew escape and go to reactivate the rebuilt Enterprise-D, Seven, joined by Raffi and those older crew members who were not assimilated, use a new strategy with their phasers to send the assimilated crew members to be trapped in the transporter room, which they locked down, including Geordi LaForge's assimilated daughters Sidney and Alandra. Then remembering that the Titan-A still has the Klingon cloaking device from the HMS Bounty installed and Fleet Formation uses line-of-sight to keep the ships together, Seven uses the cloaking device and the ability to scramble the shields of the assimilated fleet to launch hit-and-run tactics on the fleet to take some pressure off of Spacedock. This was also to help Picard once they saw the Enterprise-D on their scanners over at Jupiter and realize he's going after the source to sever the Borg Queen's connection to Starfleet, so they needed to stall and buy him as much time as they could. The tactic works, but the assimilated crew members soon escape and Geordi's daughters take out the cloaking device, leading to the Titan-A being exposed and overcome once the fleet got wise to her tactics, before being recalled back into the fleet as, having lost contact with Vox, but with the signal still active, the fleet prepares to bombard Earth after the planetary shield fell with Spacedock's capitulation, while Sidney, Alandra, and the other assimilated, reach the bridge of the Titan-A and advance on Seven, Raffi, and the others, leveling their phasers with murderous intent on their Borg-controlled minds as Seven and Raffi prepare for a last stand.
However, at that moment, before either side can fire their phasers, Sidney's Borg nanoprobes recede from her face and go inert, and she begins to come to, before finding to her horror that she was aiming a phaser set to kill at Seven and Raffi. As Alandra and the others begin to come to as well, just as horrified and shocked as the scope of their atrocities under Borg control hit home with full force, seeing them back to normal, Seven, Raffi, and their crewmembers stand down and power down their phasers, realizing that Picard and the Enterprise-D command crew did it. They destroyed the Borg Queen once and for all and severed her control over Starfleet permanently.
Seven was promoted by Captain Tuvok and given command of the USS Titan-A, which was re-christened as the USS Enterprise-G as testament and thanks to Picard and his crew for once more saving Earth and the Federation from the Borg.
==Physiology==
===As a drone===
During her time in the Collective, Seven of Nine's body was outfitted with many cybernetic systems that all Borg share, such as body armor, assimilation tubules and shields. Her left eye had been replaced with an ocular implant, but she kept both her original arms and had not been equipped with any further prosthetics. Seven was also armed with a disruptor attached to her right forearm.
===Post-Borg===
When Seven was disconnected from the Borg, her human DNA began to regenerate and reject many of her cybernetics. Her cranial plating and body armor were removed and her eyepiece was replaced with a new biosynthetic organ that retained some Borg circuitry around the optic nerve, allowing her increased visual acuity in one eye. The iris color matched her human eye perfectly, something the Doctor was very proud of. Many of Seven's cybernetic organelles and some of her brain implants were removed as well, though removing all of them would have killed her. Although her hair was regrown and her skin restored to its natural color, Seven still had swarms of nanoprobes within her bloodstream, which she could control and reprogram as she chose. Her human metabolism has atrophied during her time among the Borg and her remaining implants have kept it from fully re-developing, resulting in her needing a Borg regeneration alcove to revitalize herself rather sleeping in a bed although she occasionally needs to eat.
Among various Borg implants that couldn't be removed Seven also kept her Vocal Subprocessor giving her perfect pitch, Assimilation Tubules, a Cortical Node which couldn't be removed for an extended period of time without killing her as well as an Interlink and Sensory Nodes used for communication and allowing her to perceive cloaked individuals or objects out of phase. Seven also possesses a Proximity Transceiver so she can detect nearby drones and retained her Personal Force Field Emitter which adapts against various energy weapons and allows her to survive in space without an Exosuit.
==Relationships==
Seven of Nine has had much difficulty adapting to a human lifestyle, but over the years she has lived aboard Voyager she has established a number of different relationships with the individuals aboard.
*Captain Kathryn Janeway - Initially, Seven harbored a great deal of anger and resentment toward Janeway for forcing her to remain on Voyager. They quickly established a heated but stable working relationship but over the years Seven has come to regard the captain as her guide toward becoming an individual and would regularly turn to her for advice. In many ways, Janeway is like a mother to Seven, nuturing the ex-drone's development as a human and teaching her valuable lessons to help her fit in.
*The Doctor - The Doctor has also played a pivotal role in Seven's growth as a human being, acting much like a father to her, though he might argue that she is more of a favourite patient. Seven's cybernetically-enhanced physiology requires special medical needs and she and the Doctor have aided each other in developing new medical techniques and treatments derived from her Borg nanites. The Doctor has also taught Seven several key social skills, such as how to smile and later on how to express romantic interest.
*Chakotay - Near the end of the television series, Seven of Nine becomes romantically involved with Chakotay. At first, their dates seem to be more like research experiments rather than actual social events, but it later becomes apparent that their attraction is very much real. The relationship apparently ended some time before 2399. 
*The Borg Queen - Since leaving the Collective, Seven has come to despise the Borg as much as anyone else. She has developed a personal enmity with the Borg Queen, who is able to communicate with Seven during her regeneration periods and has used these moments to pressure her for information on Voyager, to threaten the ship or simply just to torment Seven. The Queen claims that Seven was her 'favorite' drone and has also stated that the Collective had planted Seven aboard Voyager intentionally as part of a strategy to assimilate Earth.
In the years following her return to the Alpha Quadrant she had relationships with other individuals.
*Jean-Luc Picard - following her return to the Alpha Quadrant she met Picard. The two felt a bit of kinship as they both had the experience of being assimilated into the Borg collective. In 2399 she asked Picard if he had rediscovered his humanity after being rescued from the collective. She told Picard that she was still working on regaining hers, and Picard admitted he was still working on regaining his as well.
*Raffi Musiker - Hansen developed a close bond with Musiker after meeting her, and the two women are currently in a lesbian relationship
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