BORG STARSHIP - Rogue Borg ship

In late 2369, in the two-part TNG episode "Descent", a group of rogue Borg began attacking Federation outposts and colonies in several outlying sectors with a new type of vessel, informally known as the rogue Borg ship. This unusual design was asymmetric, totally unlike the previously encountered Borg cube. However, the vessel was still heavily armed and massively armored, and capable of great destructive power.

Only one ship of this type has been observed; the ship attacked the research outpost on Oniaka III, as well as the MS-1 colony, using previously-unknown transwarp conduits to appear suddenly over the target and launch a quick attack.

A schematic variant of this design was briefly seen in the Star Trek: Voyager episode "Scorpion, Part 2", which recounted the brief alliance between the Voyager crew and the Borg in their fight against Species 8472. Referred to as a "multikinetic neutronic mine", the drone Seven of Nine proposed it to Captain Janeway as a high-yield weapon for delivering enhanced nanoprobes after having deemed Starfleet photon torpedo as insufficient.

This design is also seen in the game series Star Trek: Armada, which refers to it as an 'Assimilator' class. Its function is to assimilate or destroy any alien ship or station it encounters. However, this is not canon.

BORG STARSHIP - Borg sphere

The sphere ship was first seen in the movie Star Trek: First Contact, where it was stored within a Borg cube ship under a large slide-away hatch and used as an escape vessel upon the destruction of the cube. This particular sphere was seen to be capable of time travel. It is unknown if other sphere ships are commonly carried aboard cubes or commonly possess time travel capabilities. It was later found in the Arctic in the episode Regeneration of ST:ENT. They are equipped with reactive armour. These vessels carry a complement of 10,000 borg drones. Borg spheres were also seen in several episodes of Star Trek: Voyager. During the episode "Unimatrix Zero, Part 2", a Borg Sphere is shown firing both phasers and disruptors.

In the Star Trek: Armada game series, they are depicted as light cruisers that have the ability to rapidly regenerate their shields for a short period of time, while in the Voyager episode Dark Frontier Seven of Nine refers to one as a scout ship.

BORG STARSHIP - Borg scout

Task: Search for assimilation targets. Establish transwarp connection.

The Borg scout ship is cuboid in shape but considerably smaller than its counterpart, the Borg cube. The Borg scout ship is only several metres in length, width and depth, and holds a crew of five. A Borg scout ship was found by the crew of the Enterprise-D on a moon in the Argolis cluster in the episode "I, Borg" (TNG).

In the game Star Trek: Armada, the Borg Scout is depicted as a very small and quick ship that is shaped like a cone. The shape changes considerably between the original Armada and Armada 2.