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.