Blake infiltrates the complex only to find that his friends and the other prisoners have succumbed to the "Curse of Cygnus", a medical condition caused by the planet's atmosphere; the only treatment is a drug controlled by the fanatical cult leader Vargas.
In the midst of the confusion, Blake and Avon succeed in activating a fungicide beam which creates a clear passage through the web, enabling them to escape ahead of the oncoming Federation Pursuit Ships.
When the survivors awaken, their leader Dr. Kendall explains their important mission to deliver a valuable energy substance called the neutrotope to their home world of Destiny, to halt a fungal contamination in the food supply.
After the Liberator crew witnesses a small ship explode above the planet Cephlon, Avon, Vila, Gan and Jenna teleport down to the surface to locate two jettisoned escape capsules.
On the Liberator, a mortally injured survivor, Ensor, is brought aboard, but he holds Cally at gunpoint and forces Blake to take him to the planet Aristo, where his father awaits urgent medical supplies.
Back en route to Aristo, Avon, Vila, Gan and Jenna begin to suffer from the radiation exposure they received while on Cephlon, and require anti-rad serum to survive.
Guest Stars: Derek Farr (as Ensor and the voice of Orac), James Muir, Paul Kidd (as Phibians) Series 2 aired on BBC1, Tuesdays, mostly 7:20 p.m., 9 January 1979 to 3 April 1979.
The crew arrives at Space City where Blake seeks contact with the criminal organisation Terra Nostra as possible resistance allies, but their leader Largo may have loyalty to the enemy.
Blake and his crew then rush to the desert planet Zondar to seek the heavily guarded source of the drug known as "Shadow", which is the basis of Terra Nostra's power and the only help for Cally.
Guest Stars: Jane Sherwin (as Kasabi), Yolande Palfrey (as Veron), Alan Halley (as Arle), Martin Connor (as Berg), Sue Bishop (as Mutoid) Servalan must answer to the mishandling of the Blake affair, and she tries to have Travis eliminated by setting him up on charges of mass murder before he can testify against her.
Glynd, along with two other revolutionaries, the frail Shivan (whose face is masked with bandages), and LeGrand (a governor whose ship they later rendezvous with), claim they have enough legal evidence to non-violently overthrow the Federation.
Meanwhile, Avon and Vila sneak a miniaturised Orac, (reduced to 1⁄8th size by demonstrating controlled molecular implosion), to cheat in Krantor's Big Wheel casino and win large amounts of money.
With clues left by Docholli, Blake heads to the planet Goth to find a "brain-print" of a man named Lurgen who knew the secret location of Star One and stored it inside an amulet worn by a royal leader called "The Keeper".
Elsewhere, Vila is injured and stranded on the planet Chenga where local natives help nurse his wounds until a group of hunters called "Hitechs" capture him and take him back to their base.
Vila and Cally are unknowingly taken for organ harvesting, but are teleported aboard Liberator before they can be killed.Note: This episode was repeated on BBC1 on Monday 8 June 1981 at 7:15 p.m. Avon and Tarrant seek out a base of operations on the volcanic planet Obsidian.
Meanwhile, Tarrant tries to convince the pacifists to help them or else face slavery under Federation control, but Hower is confident that their threat to self-destruct their own world with a nuclear device will prevent any invasion attempt.
Avon and Tarrant convince a man named Groff to reverse the gravity field holding the Liberator in place, allowing its escape and ultimately destroying Krandor.
Speaking out against Servalan's incompetence is Jarvik, a subordinate construction worker who believes that as a man who is non-reliant on computerised battle planning, he has better intuition for hunting down someone like Tarrant, who was a former crew mate in the Space Command.
Arriving at the planet Kezarn, Tarrant sends Vila down to meet a contact who would supply them with crystals needed for Liberator's weapons, but once down he is instead captured by a notorious outlaw named "Bayban the Butcher" and his accomplice Kerril.
Vila declines to leave with Kerril for the new planet and narrowly escapes being killed by an enraged Bayban, who destroys the city in a brutish attempt to break down the door.Note: This episode was repeated on BBC1 on Monday 15 June 1981 at 7:20 p.m. Servalan unleashes a deadly plague upon Cally's home world of Auron in another elaborate scheme to lure the Liberator for capture.
On Earth, Avon allows himself to be captured and imprisoned for five days – all in an elaborate scheme to get close to the vicious Federation interrogator named Shrinker, who – he believes – killed his former lover Anna Grant.
The others find the world to be one massive computer system ran by a group of aliens called the Ultra who wipe the minds of trespassers and turns them into slave "menials", or processes them for food.
This would be good news for Servalan, however she quickly learns Grose has shifted loyalties and now serves a mysterious intelligence called "Moloch" which has its own plans for the control and rebuilding of the Federation.
On the Liberator, Vila convinces the others to tune in and watch the latest combat, where Tarrant discovers that one of the fighters is his estranged brother Deeta, a skilled gunman who is fighting on behalf of Teal.
Without explanation, Avon follows a series of secret messages to the artificial planet Terminal—an experiment, abandoned 411 years previously, to study the accelerated evolution of life on Earth.
Guest Stars: Gareth Thomas (as Roj Blake), Gillian McCutcheon (as Kostos), Richard Clifford (as Toron), Heather Wright (as Reeval), David Healy (as Sphere voice) Series 4 aired on BBC1, Mondays, mostly 7:15 p.m., 28 September 1981 to 21 December 1981.
He also holds another dark secret: an immortal connection to a life-draining entity that lurks in the caverns below his base, to which he intends to sacrifice the Liberator crew.Note: This episode was inspired by Oscar Wilde's The Picture of Dorian Gray.
With Dorian dead and Soolin missing, the rest of the crew find themselves trapped in the underground base with the only means of escape, the freighter Scorpio, locked behind an impenetrable security door that Vila cannot open.
Servalan arrives at the planet Virn—a world covered in strange green sand—to find out what happened to a group of Federation researchers who went missing five years earlier, soon after uncovering a substance with unique energy potential.
Guest Stars: Gareth Thomas (as Roj Blake), David Collings (as Deva), Sasha Mitchell (as Arlen), Janet Lees Price (as Klyn) (wife of actor Paul Darrow, who played Avon).