Ep 10. The Space Creature

Locked in orbit around a planet whose inhospitable atmosphere is partially composed of an unknown element, the Robinsons find themselves picked off, one by one, by a malevolent force. An errant wish from young Will brought this force into being - it is a part of him given form and evil power by the strange mist. Now Will has to face his worst nightmares if he wants to see his family again!