For the Liberator's crew the planet Obsidian offers the prospect of allies and a safe base from which to work. But Obsidian also holds a deadly secret.
Discover 11,128,835 listings and 279,763 playable programmes from the BBC
For the Liberator's crew the planet Obsidian offers the prospect of allies and a safe base from which to work. But Obsidian also holds a deadly secret.