'The Lambda Factor' was the eighteenth episode of the last 'Space 1999' series. The Moon is toodling along through an empty, quiet region of space. Everything seems okay but, in actual fact, they are being bombarded with 'Lamda Waves', which enhance crew member Carolyn Powell's latent extrasensory powers to deadly levels. Crazed with mind power she kills off a love rival, blows up her fiancee (Jess Conrad - good riddance) and then threatens to take over the Moonbase. Can anyone stop her? Actually, no. But, at a crucial moment, they drift out of the range of the Lamda Waves and everything is okay again. Except for the two dead people.
Maya turns into a chimp, a tiger and a man in a gorilla suit in this episode, and gets turned into a caterpillar by the power of Powell's Lamda saturated will. Martin Landau's 'frightened' expression in the bottom screen grab is, I think, one of the best things I've ever posted. Ridiculous.