The Doctor and Donna face monstrous insects and a ruthless robot exterminator in this thrilling, exclusive audio story, read by David Tennant. The TARDIS is lost in battle on a distant planet. When the Doctor sets off in pursuit, Donna is left behind, and finds herself accepting a commission in the Pioneer Corps. Something is transforming soldiers into monstrous beetles, and she could be the next victim. Meanwhile, the Doctor steals a motorbike and stages a jailbreak. Well, how hard can it be to find the TARDIS, rescue Donna, and negotiate a peace? But that's before the arrival of a brutal and remorseless mechanical exterminator, bent on wiping out the insects. It may be that nothing can stop it, because this robot's solution for the infestation is very simple: kill everything.