Transmitted originally: 1 February 1982 to 9 February 1982.
The Kinda, although appearing primitive, are telepathically gifted. One of the Kinda, Aris is also possessed by the Mara, and threatens to lead his people into conmflict with the survet team. Hindle becomes dangerously unstable, but his mind is eventually cleared by the Box of Jhana, a Kinda device. Aided by the Kinda, the Doctor ultimately suceeds in banishing the Mara - which manifests itself in the form of a giant snake - by trapping it in a circle of mirrors.
A sequel to the story, 'Snakedance', which saw the return of the Mara, appeared in the twentieth season in 1983.
The Fifth Doctor Novelisations