Species 8472

Species 8472 are undoubtedly one of the most unusual organic lifeforms ever encountered by the Federation. Their origins lie in 'fluidic space' - a higher dimension which is apparently composed liquid rather than the empty space of our own universe. 8472 are the only species in their dimension, and had no conception of other lifeforms until the Borg invaded their territory. Unfortunately - for the Borg - species 8472 have an incredibly efficient immune system; any form of biological or technological intrusion into their tissue is instantly rejected and destroyed. This renders them immune to Borg nanoprobes, and hence incapable of assimilation. In addition, their dense structure is highly resistant to many forms of energy such as transporters and weapons.
Physically, species 8472 has a roughly humanoid head and torso on a tripedal base. There is a mouth but they do not communicate by speech, instead relying on telepathy. The extent of their telepathic abilities are unknown, but are thought to be very long ranged, perhaps even trans-dimensional. Beyond this little is known about this enigmatic species - few have survived a close encounter long enough to gather comprehensive data!

Even less is known about the culture and philosophy of species 8472. In the one known telepathic contact with them the message 'the weak shall perish' was transmitted; although worrying given their numbers and level of technology, the outlook of a whole species can hardly be judged from one contact with one individual. For the moment contact with 8472 has been broken off after their retreat back into their own space at the end of the war with the Borg.
Extremely powerful and sophisticated ship made from biological materials. (Scorpion Part I, VOY)

Type:    General purpose warship

Unit Run:    Unknown. Numbers believed to be in the millions at least

Commissioned:    Unknown

Dimensions:       Length:    200 m    Diameter:    40 m    Decks:    1

Mass:    25,000 tons

Crew:    1

Warp Speeds

Unknown. Believed capable of Warp Factor 9.97+ in warp drive, and possibly of utilizing Transwarp conduits

Armament:    1 x High power energy weapon of unknown type, total output 15,500,000 TeraWatts

Defense Systems:     No shields, Biomolecular hull, virtually immune to energy effects

Strength Indices (Galaxy Class = 1,000)

Beam Firepower:    150,000

Torpedo Firepower:    120,000

Weapon Range & Accuracy:    2,330

Shield Strength:    0

Hull Armour:    800,000

Speed:    7,000

Combat Maneuverability:    15,000

Overall Strength Index:    130,000

Diplomatic Capability:    None

Expected Lifetime:    Unknown

Refit Cycle:    Unknown

Beyond a doubt Species 8472 represents one of the most highly evolved and advanced life forms outside of the Q continuum. Their weaponry is far and away beyond anything that the Federation has experienced before; their relatively small bioships are more than capable of defeating Borg cubes one on one, while small groups can combine their fire and use it to destroy entire planets in seconds.

Species 8472 themselves originate from beyond our dimension. They came into contact with our galaxy when the Borg invaded their space in an attempt to assimilate their biological technology. The attempt failed, and species 8472 (the Borg designation for them) responded by invading our galaxy - apparently intent on utterly eradicating not only the Borg but all other species also.