Agents of Chaos (audio anthology)

 was a full cast audio anthology released in October 2016 by Big Finish Productions. It was the third release of The War Doctor audio series. It featured John Hurt as the War Doctor and Jacqueline Pearce as Cardinal Ollistra.

Publisher's summary
When Earth comes under threat, the War Doctor is drawn into Ollistra's schemes once again. But the wily Time Lord Cardinal has not foreseen every move. The Dalek Time Strategist has its own game-pieces in play, and when volatile forces with their own agenda join the fray, no-one can predict how the war might turn...

3.1 The Shadow Vortex by David Llewellyn

Cardinal Ollistra exploits the War Doctor's affection for Earth to send him to East Berlin, 1961, on the trail of a Dalek agent. Lara Zannis has breached the planet's quantum shield on a very special mission for the Dalek Time Strategist.

Caught between MI6 and the KGB, the War Doctor must first escape the Stasi before he can hope to stop Lara. Cold War scientists are about to make a breakthrough – the Daleks want control of the "Shadow Vortex", and Agent Zannis can provide it.

3.2 The Eternity Cage by Andrew Smith

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.

3.3 Eye of Harmony by Ken Bentley

In the aftermath of events on Rovidia, the Dalek Time Strategist is presented with a unique opportunity to strike a lethal blow to the heart of Gallifrey. A devastating power is set to be unleashed, and with agents in place ready to do the bidding of the Dalek Time Strategist, the future of the Time War could turn in an instant.

Trapped inside a critically-damaged Battle-TARDIS, hopelessly adrift in the Time Vortex, the War Doctor and his allies have a final desperate fight on their hands...