The Eternity Cage was the second audio story in the anthology Agents of Chaos, produced by Big Finish Productions. It was written by Andrew Smith and featured John Hurt as the War Doctor and Jacqueline Pearce as Cardinal Ollistra.
Sontarans are the ultimate warriors – so they believe – and the Time War the ultimate conflict. Denied that glory by Skaro and Gallifrey alike, General Fesk of the Eighth Sontaran Battle Fleet employs a dangerous strategy to draw both sides to the planet Rovidia and prove his forces worthy…
Meanwhile, the War Doctor leads a rescue mission, aided by Rovidian street-urchin Kalan. Neither Daleks nor Time Lords expect the Sontarans to be so fearsome a foe, until they uncover the secret of the Eternity Cage.
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- The War Doctor - John Hurt
- Cardinal Ollistra - Jacqueline Pearce
- Heleyna - Honeysuckle Weeks
- Kalan - Josh Bolt
- Fesk/Sontarans - Dan Starkey
- Muren - Andrew French
- Vassarian - Barnaby Edwards
- Dalek Time Strategist/Dalek voices - Nicholas Briggs
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- This story marks the War Doctor's first and as yet only encounter with the Sontarans. Previously, NOTVALID: Strax Field Report: The Doctors had suggested they never met.
- The Dalek Time Strategist and Ollistra mention Narvin sending the Fourth Doctor to avert the creation of the Daleks. (TV: Genesis of the Daleks, AUDIO: Ascension)
- The Sontarans are trying to participate in the Time War. (TV: The Sontaran Stratagem; AUDIO: The Sontaran Ordeal)