The opening voiceover is very much to the point:
An autumn dusk has settled over Collinwood, bringing with it not the fear of night but a renewed hope of happiness for a young woman long acquainted with the terrors that have plagued these premises. But as the deepening dark surrenders to the night, a new threat, evil in its creation and awesome in its consequence, will reveal its final purpose, the destruction of Victoria Winters.
We then cut to a scene of Vicki with the evil creation that is destined to destroy her, her fiancé Peter. In place of a personality, Peter has a compulsion to insist that no one use his right name. Instead, he wants to be called “Jeff.” He also has a habit of pawing his scene partners and occasionally jerking them around violently. This loathsome man continually fondles Vicki in their scenes together, each time prompting Alexandra Moltke Isles first to stiffen, then to force an awkward smile when she remembers that her character is supposed to like the creep. It is painful to watch, and the more scenes Vicki has with Peter/ Jeff the sooner we hope she will leave the show.
A woman named Eve has seen Peter/ Jeff and recognized him from their previous acquaintance. She finds Peter/ Jeff alone on the terrace outside the great house of Collinwood and confronts him. He looks as uncomfortable alone with her as Vicki does alone with him. It is satisfying to see Peter/ Jeff get a taste of his own medicine, all the more so for regular viewers who know that Eve is a homicidal maniac and hope she will do him in before he blights any more episodes.
Eve has been kissing Peter/ Jeff passionately for several seconds when sarcastic dandy Roger Collins speaks up and says that he has not been introduced to her. She runs off, and Peter/ Jeff demands that Roger not tell Vicki what he has seen. Roger will not agree to that, but once the two of them are alone with Vicki in the drawing room he backs down and lets Peter/ Jeff off the hook. When Peter/ Jeff realizes Roger will keep his secret he breaks into a gleeful smile. Evil has triumphed once more.

In the early days of Dark Shadows, Roger was rather a dangerous villain. One of his crimes was perjury in a case that sent another man, one Burke Devlin, to prison for a homicide in which they were both implicated. In #201, Roger admitted to that perjury in front of Burke in this very room. That admission came after a long story arc involving the return of Roger’s estranged wife Laura to Collinwood. The Laura story absorbed all the dramatic significance of the conflict between Roger and Burke, leaving Burke nothing to do in response to Roger’s admission but to peace out. To viewers who remember that Vicki was once an interesting character and still have hopes that she will shake free of Peter/ Jeff’s baleful presence, Roger’s concession to Peter/ Jeff is an even bigger disappointment than was the too-late resolution of the Roger vs Burke story.
At the end, Roger has a dream in which it is revealed to him that if Vicki marries Peter/ Jeff, she will die. We suspect that he has missed his last chance to prevent this happening.
I’m trying to put the timeline together here for Ms. Isles departure from the show. Google tells me she her last episode was 627, which is only 10 episodes out. Certainly this “Vicki will die” if she marries Peter/Jeff feels like they were preparing to write her out, at least for a while, maybe to accommodate her pregnancy? Or maybe just to be able to write her pregnancy into the show and have it be in wedlock? I know Ms. Isles has said she was concerned they would pull a Rosemary’s Baby with her pregnancy, and was happy to leave early to avoid such a storyline. OTOH, she was very early in her pregnancy when she left, so I don’t know if the show would have known she was pregnant at this time.
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She definitely knew she was pregnant, even though it was early. But I think she was just dissatisfied with the show and wanted off.
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