The Entire Seven Of Nine Timeline Explained

In the real world, Annika's life as a Borg drone is anything but pleasant. After spending time in a Borg maturation chamber, Annika emerges rebuilt as a half-organic, half-mechanical being meant to assimilate other life forms into the Borg Collective. She is given the designation Seven of Nine, Tertiary Adjunct of Unimatrix Zero One and obeys the orders of the Borg Queen without question.

Over the next several years, Seven of Nine assists in the capture and assimilation of many alien species. As a member of the Borg Collective, she gains access to the knowledge of thousands of civilizations, making her smarter and more efficient. Unfortunately, she only uses this knowledge to continue assimilating other species.

In the Star Trek: Voyager season 6 episode "Survival Instinct," we learn that Seven of Nine had a chance to escape the Borg in the year 2368 when she and three other drones crash landed on a planet. This caused their link to the Collective to be severed and the drones to begin recovering their individuality.

However, this also caused Seven of Nine to revert back to the frightened child she was when she was first assimilated. Unwilling to become an individual after spending so much time in the Collective (and unable to access the personality she developed in Unimatrix Zero), Seven fused the drones into a miniature hive mind and let them be recaptured by the Borg.