The USS Voyager in fluidic space
Fluidic space was an extra-dimensional realm which was filled with a liquid medium rather than open space, it was the home of Species 8472. Fluidic space was accessible from the regular universe via quantum singularities. Warp and transwarp drives used by the Federation and Borg in 2377 were not functional within fluidic space. (VOY episode: "Scorpion"; TNG video game: Armada II)
In 2373 fluidic space was discovered by the Borg Collective, who launched an invasion into the realm hoping to assimilate the highly biologically developed Species 8472. The Borg's attempts proved futile and in response Species 8472 launched a counter attack, aiming to wipe out life in the Milky Way galaxy, starting with the Borg.
After several months of heavy losses the Borg were contacted by the crew of the USS Voyager who agreed to help them develop a weapon to fight 8472 in exchange for safe passage through Borg space. The Borg agreed, and later in the development of the weapon forced Voyager to enter fluidic space to test the weapon on Species 8472 vessels.
The test was a success and Species 8472's forces retreated back into fluidic space. (VOY episode: "Scorpion")
In 2377 8472 launched a new offensive on the Milky Way. They created three large rifts through which to enter the galaxy and also developed the fluidic gate, an organic structure which they used to make smaller quantum singularities to allow additional reinforcements to travel through from fluidic space.
8472's renewed hostilities eventually prompted the Borg and the Federation to form an alliance to fight back. The combined forces of the Borg and Federation successfully captured the Alpha Quadrant end of one of the three rifts and then launched an offensive into fluidic space to destroy the Rift Maker, a large Species 8472 organism that was holding the three rifts open.
Upon destruction of the Rift Maker the allied forced made a swift retreat back into the Milky Way before the rifts collapsed, holding off 8472's invasion. (TNG video game: Armada II)
Kilana was abducted with her Jem'Hadar by the Caretaker. She attempted to rejoin the Dominion by returning to the Gamma Quadrant. In an alternate reality, she was found by Kathryn Janeway. After a deal with the Voth went wrong, she found herself traped in Fluidic space. (Star Trek: Myriad Universes novel: Places of Exile)
External link
- Fluidic space article at Memory Alpha, the wiki for canon Star Trek.