The Borg sphere was first seen in action by the Federation during the Sector 001 battle. The last act of the Borg cube destroyed in that battle was to launch a sphere which generated a temporal vortex, allowing it to travel into the year 2063 in order to prevent the formation of the Federation. The Sovereign class Enterprise-E followed the sphere through the vortex, and observed it firing some form of low energy plasma weapon on Earth. The Enterprise fired a volley of quantum torpedoes at the sphere and succeeded in destroying it, although some Borg drones where able to beam aboard the Enterprise and begin assimilating it.

Subsequent to this, USS Voyager has encountered spheres on several occasions. The crew of Voyager stole a transwarp coil from a tactical sphere to assist in their attempt to reach home, and were nearly assimilated by another sphere in 2375. During the ship's trip back to the Alpha Quadrant through a transwarp conduit, Voyager was captured by a sphere which it subsequently destroyed from within.

The spheres appear to be smaller more numerous vessels than the dreaded Borg cubes. It is possible that they are built in various specialist configurations, but given the nature of the Borg it is more likely that the spheres are able to quickly adapt themselves to whatever mission is to hand. The relatively limited armament and defensive capability of the spheres suggest that they are normally configured for more scientific or scouting roles.

Type-Various configurations possible

Units-Unknown.

Date of Commission- Unknown-likely built as needed

Dimensions-Diameter: 600 meters approx. Decks- approx 160

Mass-32,200,000 metric tons

Crew Compliment-Unknown- likely in the hundreds to thousands

Armaments-Unknown beam weapon- estimated output of 50,000 terawatts.Low power plasma torpedoes

Defence Systems-Shield system- total capacity of 675,000 terajoules, Low capacity regeneration matrix, Heavy Varethiel double hull, 50.0cm high density armor, high level structual integrity field.

Warp Speed Capability-Warp 9.974.

Strength Indices(1000 is equal to a Galaxy class ship)-Beam Firepower- 1000 , Torpedo Firepower- 200 Weapon accuracy and range- 630 , Shield strengh- 250 , Hull armor- 5440 , Speed- 2500 , Combat manoeuvrability- 600

Overall Strengh Index(out of 1000)- 1000

Expected Hull Life-Unknown

Refit cycles-Unknown