The War Lords, having experimented on individuals of warlike races to determine their suitability as soldiers, decide to use humans for their army. They genetically alter the non-human survivors of their tests into killing machines. The Time Lords, unable to help these survivors, return them to their own planets. The Doctor, Jamie and Zoe, on the run from the Time Lords, materialise on the planet. They retrieve Ossu-male’s body from the sea. As he breathes his last, the TARDIS’ cloister bell rings and they leave the planet.