Moss (Planet of the Spiders)

Moss was a resident of K'anpo Rimpoche's meditation centre. He, Barnes, Land and Keaver worked with Lupton to summon the Eight Legs to Earth. He was taken over by them, but was freed when the Great One died. (TV: Planet of the Spiders)

Behind the scenes
In the novelisation by Terrance Dicks, it is stated that Moss, Land, Barnes and Keaver were hospitalised with nervous breakdowns following events at the meditation centre. This was not derived from any information given in the televised version.