House of Dark Shadows is the theatrical-feature spin-off of the popular 1960s TV "Gothic" serial Dark Shadows. Jonathan Frid is on hand again as 150-year-old vampire Barnabas Collins, once again going about his business in the spectre-filled Collinswood mansion. Another carryover from the TV series, Carolyn Stoddard (Nancy Barrett), finds her blood supply depleted by the elusive Mr. Collins. When Carolyn dies, it isn't long before she's wandering the hallways as one of the "undead." Barnabas persists in his bloodsucking activities until he makes the error of falling in love with mistress-of-the-house Maggie Evans (Kathryn Leigh Scott).