Blake's 7 (1978)

Roj Blake is a former rebel leader who once led a resistance group against the evil intergalactic government the Federation, The Federation has drugged the air, water and food to control it's citizens. But Blake was captured and was brainwashed and his memories were erased. After learning the truth about himself from outlawed protesters. Blake is apprehended, when the protesters are slaughtered by Federation Guards. The Federation frames Blake for a series of crimes he didn't do and Blake is sentenced to exile on the Federation prison planet Cygnus Alpha. But as Blake and a group of convicts are being transported to Cygnus Alpha, a abandoned alien spaceship pulls up alongside the prison ship, allowing Blake to escape. Renaming the alien spaceship "The Liberator" and joined by escaped convicts. Blake and the crew of "The Liberator" travels across Outer Space as they set out to overthrow the Federation and liberate the Federation controlled worlds.