A Borg Sphere

In the Star Trek fictional universe, the Borg Sphere is a type of spherical starship, several hundred meters in diameter, used by the Borg Collective. 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. The sphere was later 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.

The Borg Spheres were also seen in several episodes of Star Trek: Voyager whenever the Voyager crew encountered the Borg. It appeared that they were being used as scout ships, perhaps a detachment from a larger Borg Cube.