In 2373 the crew of the USS Voyager forged an alliance with the Borg in order to combat Species 8472; as part of that alliance Captain Janeway agreed to work aboard a Borg vessel to develop a weapon to be used against 8472. Rather than assimilate the Captain, the Borg agreed to assign a single drone to work with her as their representative. The Borg chosen was seven of nine, tertiary adjunct to Unimatrix zero one. Despite their promises the Borg rapidly turned against Voyager and attempted to assimilate the ship. The crew where able to kill all the Borg aboard apart from seven of nine, who they separated from the collective consciousness. Voyagers EMH program subsequently removed most of seven of nines Borg implants. Janeway discovered that seven of nine was in fact an assimilated Human being; she was later identified as Annika Hansen, the child of two Federation citizens who took their spacecraft into the delta quadrant many years ago in order to explore. Nothing was heard of the Hansens again, but seven revealed that their ship had been captured by the Borg and they had been assimilated along with their six year old daughter Annika. She lived the next eighteen years of her life as a Borg drone, participating in the assimilation of many species, until 'rescued' by Voyager. Seven had become a fully integrated member of the collective, and had no desire to be returned to Humanity. As soon as she had the chance she attempted to alert the collective to Voyagers location, but was prevented from doing so by Kes. Over the next few years she gradually began to accept her Humanity more, experimenting with various aspects of life as a Human. Somewhat ironically it was Voyager's EMH who served as her mentor in Human interactions, and at one time the two shared an attraction for one another. This never developed into a romantic relationship, however. Seven also had several encounters with the Borg collective during her time on Voyager. In 2375 the Borg Queen revealed that she had been deliberately allowed to remain on the ship in order to collect information about Humanity. However, Seven rejected the Queen's attempts to make her assist with the assimilation of Humanity and returned to Voyager. In 2376 Seven met several ex-drones who had escaped the collective but were still linked together. During their time with the collective they and Seven had been briefly liberated by an accident which caused their ship to crashland on a planet. The others had wanted to leave the collective permanently, but Seven had panicked and re-assimilated the group into a new mini-collective until they could be re-assimilated. When the three were eventually freed of the collective they retained the link Seven had created, and they spent some time tracking her down in an attempt to regain their individuality. Seven agreed to remove the link, even though this would result in their eventual deaths. Seven continued to acquire more Human-like attitudes over the next two years. Her recovery of the body of John Kelly gave her a greater appreciation of history, while the difficult emotions she experienced as a Tsunkatse fighter affirmed that she was becoming more individualistic. When she assisted the Borg rebels of Unimatrix Zero, a virtual environment which a small fraction of Borg drones enter during their regeneration, she found that she had enjoyed a romantic relationship during her time there. Although she never became involved with the EMH despite their mutual attraction, she later developed feelings for Commander Chakotay, an attraction which he shared. The two began dating in late 2377, shortly before Voyager reached the Alpha Quadrant.