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Blake (Gareth Thomas) and his fellow escapees pilot the Liberator to the prison planet Cygnus Alpha. Here he frees several convicts who agree to join Blake in his ongoing battle against the Federation. Unfortunately, several of these new insurgents fall ill to a deadly virus. The only serum capable of curing the fallen warriors is possessed by religious fanatic Vargas (Brian Blessed) -- and he is none too sympathetic to Blake's noble cause. "Cygnus Alpha" was originally telecast on January 16, 1978.