Blake's 7 is a British science fiction television programme produced by the BBC. Four series of thirteen 50-minute episodes were broadcast on BBC1 between 1978 and 1981. It was created by Terry Nation, who also wrote the first series, produced by David Maloney (series one to three) and Vere Lorrimer (series four), and the script editor throughout its run was Chris Boucher, who wrote nine of its episodes. The main character for the first two series was Roj Blake, played by Gareth Thomas.

Blake's 7 was broadcast in 25 other countries. It had a low budget but featured many tropes of space opera, such as spaceships, robots, galactic empires and aliens. Critical responses have been mixed; some praised the programme for its dystopian themes, strong characterisation, ambiguous morality and pessimistic tone, as well as displaying an "enormous sense of fun", but others have criticised its production values and dialogue, and accused it of lacking originality. It retains a sizeable and enthusiastic fan base, and was described in The Guardians 40-year retrospective as "a bold show that wasn't afraid to break formulas".

A limited range of Blake's 7 merchandise was issued, and books, magazines and annuals were published. The BBC released music and sound effects from the series, and several companies made Blake's 7 toys and models. Four video compilations were released between 1985 and 1990, and the entire programme was released in videocassette beginning in 1991 and re-released during 1997, and as four DVD boxed sets between 2003 and 2006. The BBC produced two audio dramas during 1998 and 1999, featuring original cast members, that were broadcast by BBC Radio 4. Although proposals for live-action and animated remakes have not been realised, Blake's 7 has been revived with several series of audio dramas from Big Finish featuring the original cast, and a audio drama reboot with new cast from B7 media.

Starting in 2024 the series was released on Blu-ray, one series per year with updated special effects for all episodes.

Overview Four series of thirteen 50-minute episodes were made, and first broadcast in the United Kingdom between January 1978 and December 1981 by BBC1. They are set in the third century of the second calendar (this is mentioned in associated publicity material, not in the series)The Federation introducing a 'new calendar' is mentioned in the episode "Pressure Point"). () and at least 700 years in the future.In the episode "Killer", a 700-year-old space ship is encountered, one of the first deep-space missions from Earth.

Blake's 7s narrative concerns the exploits of political dissident Roj Blake, who leads a small group of rebels against the forces of the totalitarian Terran Federation that rules the Earth and many colonised planets. The Federation uses mass surveillance, brainwashing, and drug pacification to control its citizens. Blake is arrested, tried on false charges, and deported to a remote penal colony. En route, he and fellow prisoners Jenna Stannis and Kerr Avon break free and escape on a technologically advanced alien spacecraft, which its central computer 'Zen' refers to as the Liberator (a word Jenna was thinking when the ship probed her mind). Liberators speed and weaponry are far superior to any Federation craft, and it also has a teleportation system that enables transport to the surface of planets. It also contains rooms filled with clothes and precious gemstones, and a medical bay facility. After freeing fellow prisoners Vila Restal and Olag Gan from the penal colony, and recruiting alien telepath freedom fighter Cally, Blake and his new crew use the Liberator to begin a campaign to damage the Federation, but are pursued by Space Commander Travis—a vengeful Federation officer—and Servalan, the Supreme Commander and later Federation President.

The composition of the titular "seven" changes throughout the series. The initial group—Blake, Vila, Gan, Jenna, Avon, and Cally—included Zen as the seventh member. At the end of the first series, they capture a supercomputer named Orac. Gan is killed during the second series, and the five remaining humans and two computers make up the defacto seven. After the end of the second series, Blake and Jenna disappear and are replaced by new characters Dayna and Tarrant. At the start of the fourth series, Cally dies and is replaced by Soolin. After the destruction of Liberator, the computer Zen is replaced by a new computer, Slave, on board the group's new commandeered ship Scorpio.

While Blake is an idealistic freedom fighter, his associates are petty crooks, smugglers and killers. Avon is a technological genius who, while apparently motivated by self-preservation and wealth, consistently acts to help others. By the third series, after Blake has gone missing, Avon becomes the leader. At first, Avon believes the Federation has been destroyed; he becomes tired of killing, and seeks rest. However, by the middle of the third series, Avon realises that the Federation is expanding again, faster than originally realised, and he resumes the fight.

The BBC had originally planned to conclude Blake's 7 at the end of its third series, but a further series was commissioned unexpectedly following the broadcast of its final episode. As a result, some changes to the programme's format were inevitable, both in front of and behind the camera. These included the appointment of a new producer and the introduction of a new spacecraft, Scorpio, and new characters, Soolin and Slave.

Blake's 7 was watched by an average of 9 million viewers in the UK, and was broadcast in 25 other countries.

Characters

Regular characters Roj Blake, played by Gareth Thomas (leader of the crew in series 1–2, guest appearances in series 3–4). Blake is a long-term political dissident who uses the Liberator to wage war on the Federation. He is passionately opposed to the Federation's injustice and corruption, and he is prepared to lose his life in pursuit of its destruction. He thinks nothing of placing himself in danger to protect his crew or advance his cause. Although Blake is respected by many of his crew members, Avon accuses him of fanaticism and recklessness. Kerr Avon, played by Paul Darrow (series 1–4, leader of the crew in series 3–4). Avon is an electronics and computer expert who once attempted to steal 5 million credits from the Federation banking system. He distrusts emotion, and he attempts to pursue a code based on logic and reason. This frequently causes conflict with Blake. He becomes a reluctant rebel and, at times, he seems motivated by financial gain and shows his readiness to put companions in danger in order to protect himself. He has an ambiguous and sometimes playful relationship with Servalan. Avon appears in 51 of the series' 52 episodes, being absent only in the first episode, "The Way Back". Vila Restal, played by Michael Keating (series 1–4). Vila is a skilled thief, lock-picker and conjurer and is usually reluctant to risk his life. His behaviour is often cowardly and, although other crew members regard him as tiresome, he has a high IQ. He has weaknesses for alcohol and women, and apparently talks to himself at times. Vila is the only character to appear in every episode of the series. Jenna Stannis, played by Sally Knyvette (series 1–2). Jenna is a former space smuggler and skilled pilot who becomes adept at piloting Liberator. She has a great deal of affection for Blake, and she is loyal to him once he gains her trust. In earlier episodes, Jenna often maintains her opinions stubbornly. Cally, played by Jan Chappell (series 1–3). Cally is an alien guerrilla fighter from the planet Auron. She is a telepath, like all of her people, who can transmit thoughts silently to others. She later develops mind-reading, telekinesis and precognition abilities, but she is also uniquely vulnerable to telepathic control by alien forces. Cally develops as the moral conscience of the group, especially for later episodes of series 2 and throughout series 3. Dayna Mellanby, played by Josette Simon (series 3–4). The daughter of former dissident Hal Mellanby, Dayna is an expert in weapons technology. She is adept at designing mechanized weapons but also appreciates the nobility of what she describes as more 'primitive' combat. Brave and loyal, but at times reckless and naïve, she often successfully challenges men who are supposedly accomplished fighters. Her vendetta against Servalan (who murdered her father) motivates her to endorse Avon's fighting of the Federation. Del Tarrant, played by Steven Pacey (series 3–4). Tarrant is an expert pilot who trained with the Federation before beginning illegal activities. He is ruthless and charming, and he often challenges Avon's leadership. He also takes advantage of the cowardice of Vila, whom he bullies into performing his instructions. Olag Gan, played by David Jackson (series 1–2). Having killed the Federation guard who murdered his girlfriend, Gan has been implanted with an electronic "limiter" device which prevents him from ever killing again. However, he is courageous, strong, and dedicated to Blake's cause. Soolin, played by Glynis Barber (series 4). Soolin is an expert gunfighter whose parents were murdered when she was a child on her home planet of Gauda Prime. She joins the group after she is betrayed by her partner Dorian. No-one can match her speed at drawing a gun. Soolin's logical and cynical attitude proves an asset to her colleagues. On several occasions, her quick thinking and prescient actions save the crew from perishing, overpowering the assassin Cancer and surviving the Betafarl Conspiracy. Barber had also previously played the role of a Mutoid in series 1 (episode 9: "Project Avalon"). Orac, voiced by Derek Farr (first appearance) and Peter Tuddenham (series 2–4). Orac is a super-computer capable of reading any other computer's data and built by an inventor named Ensor. It uses a component called a Tariel cell—a universal computer component—and can access information stored on any computer that uses one. It can also control other computers. Orac dislikes work that it considers unnecessary, enjoys gathering information and has delusions of grandeur. Zen, voiced by Peter Tuddenham (series 1–3). The main computer aboard Liberator, Zen controls the craft's secondary systems, including the battle and guidance computers. It is susceptible to interference from outside influences, such as Orac. It is considered a character in its own right. It is rendered nonfunctional after Liberator is damaged by corrosive fluid particles, and is destroyed with the ship. Slave, voiced by Peter Tuddenham (series 4). Introduced during the fourth series, Slave was built and programmed by Dorian and is the master computer of Dorian's ship, Scorpio. It has a cringing personality, frequently apologetic and obsequious, and addresses Avon as 'master' and others as 'sir' or 'madam'.

Other recurring characters Supreme Commander Servalan/Commissioner Sleer, played by Jacqueline Pearce. Servalan began her service career as a cadet, and eventually becomes Supreme Commander of the Terran Federation. Her desire for power began at the age of eighteen when her lover abandoned her. Shortly before the Intergalactic War, Servalan conducted a military coup and installed herself as president. She is later overthrown herself and presumed killed, but survives and adopts the pseudonym of Commissioner Sleer. She conducts a campaign of drug-induced pacification in order to regain territory for the Federation and her own position of power. Servalan is determined to pursue the crew of the Liberator and win control of the ship and Orac for herself.