Doctor Who Season 22 Episode 11

For his impending confrontation with the mysterious and cloistered Borad, dictator of Karfel, the Doctor takes kontrom crystals from the Timelash to build a 10-second time break device, not knowing of the Borad's mutation and breeding plans for Peri or the interplanetary war he's sparked with the Bandrils, who are on their way to destroy all mammalian life on Karfel.