WHILE THEIR FRIEND NYSSA RECOVERS FROM mental disorientation in the TARDIS, the Doctor and his companions, Tegan and Adric, explore the sub-tropical paradise of Deva Loka. The Doctor and Adric discover a domed expeditionary base and meet the three remaining members of a colonial assessment team. Science officer Todd has been studying the indigenous people, the Kinda, who are mute and culturally non-hostile. She believes that they communicate telepathically and may not be as primitive as they appear.