Liberator (Blake's 7)
The spaceship Liberator is a fictional starship featured in the first three seasons of the BBC television series Blake's 7.
Background
In the TV series, the Liberator was an abandoned spacecraft found drifting near Cygnus Alpha. It was equipped with powerful weapons, force field protection, and a system of "battle computers". The ship was originally built by a race of beings known as "The System". The System referred to the ship as DSV2 ("Deep Space Vehicle 2"), a designation that suggests it was specifically designed for long-range forays outside the territory controlled by The System, and confirming more than one such ship had ever been made. It had at least one sister ship, which was destroyed by Orac in the episode "Redemption" (it is never clarified if the sister ship that Roj Blake encountered was DSV1).
The ship was controlled by an advanced AI computer calling itself Zen. Although it is not at the time clear whether this was the computer's official name, during the episode "Redemption" the System's controllers, (referred to as "Altas"), had boarded the ship and also referred to the computer as Zen.