Blake's 7 : Volcano (1980)
Directed by Desmond McCarthy
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Synopsis by Hal Erickson
Avon (Paul Darrow) chooses the peace-loving planet Obsidian for his new headquarters. Dayna (Josette Simon) and Tarrant (Steven Pacey) likewise arrive on Obsidian, hoping to negotiate a truce between their warring civilizations. Alas, Servalan (Jacqueline Pearce) is prepared to launch an attack upon Obsidian -- whose residents would sooner die than abandon their pacifist philosophy. "Volcano" first aired on January 21, 1980.