Blake's 7 - Season 3 (1980)

The Liberator is drawn off course by an artificial black hole. Orac brings the ship too close in order to study the phenomenon, and, unable to break free, the Liberator is dragged through into an "impossible" starless black void... or is it? Orac's science is pitted against a legendary figure from Cally's childhood stories.

Tarrant convinces the others to launch a raid on a Federation transport loading a cargo of valuable crystals from the planet Kairos, and Servalan recruits a retired officer who once served with Tarrant to stop him.

The Liberator crew makes a deal with a outlaw, known as Bayban the Berserker, in order to obtain crystals needed for the Liberator's weapons system. Bayban, in return, requires Vila's help to find a treasure on the distant planet Keezar; and Vila falls in love with Kerril, one of Bayban's gang members.

Servalan has unleashed a plague on Cally's home planet Auron as a lure for the Liberator and its crew. It works, as Cally receives a telepathic message calling for help and she is compelled to go there. Servalan is also using Auron's advanced technology to create clones in her image; her children, as it were.

Avon sets out on a personal vendetta to avenge the murder of his lover Anna Grant, killed by the Federation torturer Shrinker. But Avon was deceived, and learns that Anna is alive and she, along with a resistance group, have taken Servalan captive.

Avon, Cally and Vila investigate a derelict spacecraft. When they return to the Liberator, the spirit of a long dead alien woman comes back with them, causing power failures on the ship and creating illusions for the crew. Using Cally as a conduit, she requires the crew to transport her back to her home planet. The fight for control of the Liberator quickly becomes a battle of the mind.

The Liberator detects a mysterious spiky metal globe floating in space. Avon deduces that it is an artificial planet, but can't raise any communication. Then Cally disappears - apparently abducted inside the "planet". As well as affecting minds, this "Ultraworld" turns out to be capable of stealing them - and using the zombified bodies of space travelers to trap others. But the crew must ultimately face the menace that rules from the center of the Ultraworld...

The Liberator follows Servalan's flagship to Sardos, where a rogue Federation officer has designs on the galaxy.

Tarrant's elder brother Deeta is competing in a gladiatorial ceremony, where combatants fight each other to the death to settle Interplanetary feuds. Servalan is acting as a judge, but she is manipulating events to trigger a real war.

After Avon receives mysterious instructions, he, for reasons he will not share with the others, is determined to follow them. They bring the Liberator to the artificial planet Terminal, passing through a cloud of fluid particles on the way. Avon goes down to the surface and finds Blake, connected to a life support system, and Servalan, who is holding him captive. While they negotiate the release of Blake in exchange for the Liberator, the fluid particles start eating away at the ship.