Sarcastic dandy Roger, possessed by the spirit of wicked witch Angelique, visits mad scientist Dr Lang. The village of Collinsport was once a whaling center, and Lang is mindful enough of that long-ago history that he collects harpoons. Roger appears to be fascinated by Lang’s collection. He holds one of the finer pieces, admires it, fondles it, and tries to kill Lang with it. At the last moment, the murder is prevented by recovering vampire Barnabas and Julia, who is a scientist as mad as Lang but infinitely more interesting. As is typical of supernatural beings on Dark Shadows, Angelique projects her power through a portrait of herself; the portrait also has some adventures today.
There is a lot of great stuff in this one, as other bloggers have well explained. The 1960s were the heyday of Freudianism in the USA, and in the first year of the show the influence of that school of thought could often be traced in the scripts of Art Wallace and Francis Swann. Patrick McCray documents in his post on The Dark Shadows Daybook that this was an episode where writer Gordon Russell allowed himself to cut loose and have fun with the sillier side of the Freudian approach.
On his Dark Shadows Every Day, Danny Horn focuses on the scene where Barnabas and Julia decide to go and stop Roger. He points out that it is the first conversation they have had about something other than themselves, the first time Barnabas shares with Julia the secret of how he became a vampire, the first time they take heroic action, and the first time they are recognizably friends. It is that friendship that will drive the action of the show from now on.
In their meticulously detailed summary of the action of the episode on their Dark Shadows Before I Die, John and Christine Scoleri capture the effect on the audience of the steady accumulation of one absurdity upon another as the episode goes on. Reading their unfailingly matter-of-fact description of the ever-mounting lunacies we witness in this half-hour is almost as exhilarating as it was watching them in the first place.
Acilius on Dark Shadows 