Blake's 7: The Palluma Project (13)

When the Liberator discovers a mysterious penal outpost in an obscure part of the galaxy, the crew soon find themselves fighting for their lives - not only against the convicted criminals the Federation are using as scientists, but against the horrifying results of their experiments.

What is the deadly secret of the people of Palluma 25 and why is it so valuable to the Federation? Only Gan holds the key to unlock what is really going on...