A meeting in a London bus with jewel thief Lady Christina takes a turn for the worst for the Doctor when the bus takes a detour to a desert-like planet, where the deadly Swarm awaits.
简·西摩 杰奎琳·麦根斯 斯蒂芬·亨特 可可·杰克·吉利斯 Jenna Kenney Nicole Pastor Mike Duncan Michael Budd 布伦丹·多诺休 Kate Ryerson Rory Potter Suzan Mutesi 格雷格·埃克尔斯顿 Isabel Macmaster Fletcher Watson