Blake's 7 'un 1 sezonu BBC One 'da lundi 2 janvier 1978 'dan lundi 27 mars 1978'a kadar yayınlandı. 13 bölümlerinden oluşuyor, ilkinin adı "The Way Back" ve sonuncusunun adı "Orac".
Seven very different individuals with one common connection: they are all escaped prisoners sentenced to live out the rest of their lives on Cygnus Alpha, a barren and sparsely populated prison planet far from Earth, by a corrupt totalitarian government known as the Terran Federation. Blake, a former resistance leader who had his memories suppressed by the Federation, must now try to hold together his assorted crew of criminals and others. They have control over a very powerful, but mysterious spaceship they call the Liberator. Together they try to bring down the corrupt and tyrannical Federation.