There have been three producers of Blake's 7 audio dramas: BBC Radio, B7 Productions and Big Finish Productions.
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BBC Radio
In 1998, the series returned to the BBC on the radio. The stories were set during the fourth series between the episodes Stardrive and Animals. They were broadcast on BBC Radio 4.
In 2006, B7 Productions announced that it had recorded a series of 36 five-minute audio adventures. The new series was broadcast on BBC Radio 7 as three hour-long episodes.
The Early Years
B7 Productions also produced series of 30-minute prequel audio episodes, which explored the earlier histories of the central characters. These were broadcast on BBC Radio 4 Extra from 2010.
The Liberator Chronicles
In 2011, Big Finish Productions, under licence from B7 Productions, announced that it would be producing a series of audio dramas which would be " ... a series of exciting, character-driven tales that remain true to the original TV series. We’re aiming for authenticity – recreating the wonder of 1978 all over again!”
The Classic Audio Adventures
These are a series of Big Finish Productions single CD releases featuring the complete cast of the TV series reprising their roles.
The first audio drama was a standalone story taking place between the end of the second series and the start of the third.
The first full series of audio dramas takes place during the second television season (B), between episode 10 (Voice from the Past) and episode 11 (Gambit).
Following the success of the first series, a second was released, set during season C after episode 8 (Rumours of Death), and following on from the Liberator Chronicles sets 3 (The Armageddon Storm) and 9.
Lucifer Trilogy
These form a trilogy of Big Finish Productions single CD releases featuring Paul Darrow of the TV series reading these adventures.
These audio dramas take place after the end of the fourth series.