The Sphere
From Tardis Wiki, the free Doctor Who reference
A Void Ship is a spacecraft which can be used to explore the Void that exists between alternate universes. Because of this, it is possible for the ship to be removed from time and space.
Until the ship is activated, it has no mass or heat or anything that allows the ship to be detected.
Currently, the only known Void Ship in existence was used by the Daleks of the Cult of Skaro to escape the Time War. It is unknown if they built it themselves or if it was sucked in the void.
