Blake tries to rescue the rest of the prisoners from the prison colony on Cygnus Alpha, and from the clutches of the high priest Vargas.
Using their new ship, the Liberator, Blake and his crew persue the London to the prison planet Cygnus Alpha.
During the voyage, the ship is searched and Avon discovers that the Liberator is equipped with a teleport device, so on their arrival at Cygnus Alpha, Blake teleports down to the planet.
Once there, he discovers that the inhabitants of Cygnus Alpha have formed a strange religious order, and that a deadly disease has infected the other prisoners. This disease can be treated, but not cured, by the resident monks. Anyone leaving the monk's sphere of influence will die.
Blake eventually discovers that the disease is a sham, perpetrated by the ruler, Vargus, to force new prisoners to convert to his prevailing religion.
The prisoners break out aided by Blake and the teleport device, but he only manages to rescue Vila and Gan - most of the others are killed. Vila and Gan join Blake, Avon and Jenna on the Liberator.
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