The Eternity Cage

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.