Blake's 7 is about a rebel ..Blake he fights against the forces of the totalitarian Federation which rules the Earth and many other planets.
The Federation (unlike in star trek is bad) controls its citizens by means of mass surveillance, brainwashing, and pacification with drugged food, water and air a bit like orwells 1984 in space.
Sentenced to deportation to a penal colony on a remote planet the federation accuse him of being a paedophile so the other prisoners will hate him and try to kill him they also have plans to kill him when he gets to the penal planet.
The prison transport ship discovers a ship floating in space its a advanced alien spacecraft(very Mary Celeste ), the alien ships security system tests the prison officers who try to board the alien ship ,the ship kills many who try then the prison officers who are on the transport ship come up with the idea of sending the prisoners over to see what is happening and why there guys are not coming back ..Blake manages to disable the security system and take control of the ship which is now named The " Liberator", a spacecraft far in advance of anything the Federation possesses and blake takes control of the liberator and makes his escape
with superior speed and weaponry as well as a revolutionary teleport system that allows crew members to be transported to the surface of a planet without having to land the ship.
Blake and his crew then attempt to disrupt and bring down the Federation. Whereas Blake is an idealist freedom fighter, the others are criminals, including petty crooks, smugglers and killers this makes the crew dynamic very interesting unlike star trek where you know 90% of the time the crew will always work together in blakes seven you dont know who is going to die or betray who. Above all there is Kerr Avon, a technical genius more interested in saving his own skin and getting rich than striking a blow for freedom, ironically a psychopath with a conscience as it turns out.
Later on in the series, when Blake is separated from his crew, Avon takes over, confirming the inherent duality in his personality and the loyalty he had for Blake's vision, but he still remains a target for the forces of the Federation. the series followed these exploits

Blakes seven was primarily noted for its strong character interaction, ambiguous morality and its dark, pessimistic tone not its special effect which were really poor


The series went on for too long , the loss of the liberator was when i stopped liking the series as much.

I always thought it would make a great film but a series of no more than three seasons would be good i think.

to make a series work
They need to have just as good actor as Blake in Avon they need brilliant effects for the liberator . The key thing is the tone of the series it need to be dark and nasty.
The federation needs to be evil really evil for it to work.