After landing on planet M-113, the Enterprise is stalked by a creature which can assume the shape and form of anyone it chooses, and which kills by removing the entire salt content of its victims' bodies.
A recently widowed, ex-film star (Ida Lupino) attempting a comeback suffers traumatic incidents that parallel her early movies.
A singing student is turned into a glamorous Parisian nightclub singer by Solo, Illya and Mr. Waverly when they use her to trap jewel thieves.