Borg cube

The Borg cube is the primary vessel of the Borg Collective. Measuring 28 cubic kilometers in volume and carrying up to 200,000 Borg drones, the cube is one of the most powerful vessels in the galaxy. (VOY: "Dark Frontier")

Encounters
The first Federation contact with a Borg cube took place in 2365, when the USS Enterprise-D encountered a single cube in System J-25. (TNG: "Q Who?")

Every Starfleet encounter with a single cube has resulted in heavy losses. 39 out of 40 ships were lost at the Battle of Wolf 359 in 2366, and dozens more in the incursion of 2373. (TNG: "The Drumhead"; Star Trek: First Contact) A single cube is capable of eliminating all elements of civilization from an entire planet.

When the USS Enterprise-D experienced malfunctions due to nanites in 2366, sensors erroneously detected an approaching cube. (TNG: "[[Evolution (episode)|Evolution")

Appearances

 * Canon appearances
 * Star Trek: The Next Generation:
 * "Q Who?"
 * "The Best of Both Worlds, Part I"
 * "The Best of Both Worlds, Part II"
 * Star Trek films:
 * Star Trek: First Contact
 * Star Trek: Deep Space Nine:
 * "Emissary"
 * Star Trek: Voyager:
 * "Unity"
 * "Scorpion, Part I"
 * "Scorpion, Part II"
 * "Hope and Fear"
 * "Dark Frontier"
 * "Collective"
 * "Unimatrix Zero, Part I"
 * "Unimatrix Zero, Part II"
 * "Q2"
 * "Endgame"
 * Fanon appearances
 * Star Trek: Unity

Background
The original design for the Borg cube was created by Rick Sternbach.