Pippa Scott plays a schoolteacher held captive in a decrepit Southern mansion (familiar from "Pigeons from Hell") by the Harrod family. The eldest (James Griffith) is an alcoholic doctor, with two much younger siblings, a boy (Tommy Nolan as Rennie) and a girl (Beverly Washburn as Lollie). Then there is Granny (Jeanette Nolan), a cackling old hag who reveals that an invisible force (the 'parasite') is tormenting the Harrods, especially the long suffering Lollie. Objects levitate and blood welts appear on the poor girl, who fears that the authorities will soon be coming for her. Jeanette Nolan really chews the scenery, playing a similar role in "La Strega," while Pippa Scott and James Griffith would both later appear on separate entries of KOLCHAK: THE NIGHT STALKER. Tommy Nolan previously appeared in "Child's Play." Beverly Washburn (born 1943) had an extended juvenile career, including an episode of WAGON TRAIN opposite the late Lou Costello ("The Tobias Jones Story"). She also appeared on STAR TREK ("The Deadly Years") and did feature films such as the 1964 cult production "Spider Baby or The Maddest Story Ever Told," opposite Lon Chaney Jr.(a personal note: I adored her). The recent DVD release includes Beverly's own insightful commentary on this episode.