Mad scientist Cyrus Longworth has devised a potion that alters his appearance so that even the people who know him best, including his fiancée Sabrina Stuart and his attorney Larry Chase, cannot recognize him. When he is thus disguised he calls himself “John Yaeger” and indulges his sadistic impulses. One of his favorite hobbies is beating and intimidating a woman named Buffie Harrington, who submits to his abuse for psychological reasons the show never explains, but for clues to which Elizabeth’s Eis’ performance keeps us watching closely. Buffie does not know that Yaeger is really Cyrus. As Sabrina and Larry have not recognized Cyrus when they saw him as Yaeger, so Buffie has not recognized Cyrus when she has met him undisguised.
The only person who has so far figured out Cyrus’ secret is chemist Horace Gladstone. Cyrus bought a vital ingredient for his potion from Gladstone, who knows that it can be used to change a person’s appearance. He has had dealings with Cyrus when he was presenting himself as Yaeger, has seen his handwriting in both states, and has questioned both Sabrina and Buffie. Combined with several other pieces of evidence, Gladstone was able to build an overwhelming case that Yaeger is merely Cyrus in disguise. Yesterday he demanded Cyrus pay him $10,000 in return for a continued supply of the ingredient and his silence. Cyrus responded by drinking the potion to assume his disguise, going to a dark alley where he had gleaned from an indiscretion on Larry’s part Gladstone would be waiting, and murdering him. Larry arrived at the scene a moment later and pursued “Yaeger” on foot from the alley to the courtyard behind Cyrus’ place. He saw “Yaeger” jump the fence into the courtyard.
As Yaeger, Cyrus enters his laboratory through the door in the courtyard. He is about to take the antidote to change his appearance back to normal when he hears Sabrina and Larry coming downstairs. He hastens out the way he came. Eavesdropping through the courtyard door, he is relieved to hear Larry say that he did not get a good enough look at him to be able to make a positive identification. He hears Larry place a call to the police, and exits.
Cyrus goes back to the alley where he killed Gladstone. Buffie enters, getting off her shift as a barmaid at the Eagle tavern. The tavern abuts the alley, but evidently the police didn’t think it was necessary to bother her with news of the murder. He demands she do him a favor. She says she is too tired to do anything tonight; he says it’s better to be tired than dead. Whatever it is that compels Buffie to keep coming back to Cyrus in his Yaeger form is strong enough that this death threat does not drive her away. She protests that she does not have a criminal record and wants to keep it that way; he tells her she won’t get caught. He gives her the keys to his lab and the combination to his safe and orders her to take the bottle containing the antidote. He tells her to bring the bottle to him in a cave on the beach below the estate of Collinwood.
Buffie goes to the courtyard door. She is about to open it when she hears Sabrina and Larry inside the lab, talking about Gladstone’s murder. When the name “John Yaeger” comes up as a suspect, she looks down. We can see a forlornness in her face. She is as much addicted to his hard domination of her as Cyrus is addicted to violence, but she still does not want to think of herself as a criminal, certainly not as an accessory to murder.
When Sabrina and Larry go upstairs, Buffie lets herself in to the lab. She has removed the painting that covers the safe and is starting to turn the dial for the combination when she hears Sabrina tell Larry she has to go back downstairs to retrieve something she left in the lab. Buffie hides by the door while Sabrina collects her purse. The purse is right next to the painting, but the room is dark. We are in suspense whether Sabrina will see it. She doesn’t, she leaves, and Buffie gets the bottle.
In the cave, Cyrus notices footprints going up to a pile of stones that appear to be a natural part of the cave wall. He realizes that the stones must be hiding a secret passage. He is curious where it leads, and figures it will be at least half an hour before Buffie comes. So he starts pulling the stones down.
Cyrus follows the path into the basement of the Old House on the grounds of Collinwood. This house is currently occupied by writer Will Loomis and his wife, the former Carolyn Collins Stoddard. Cyrus realizes where he is, and finds a chained coffin. He wonders what secret Will might be hiding from the world. He decides that if the secret is shameful enough, it might come in handy. He breaks the first chain, intending to open the coffin.
The opening voiceover, delivered arrestingly by Eis, told us what is in the coffin. It is a visitor from a parallel universe. He is named Barnabas Collins, and he is a vampire. Will is holding Barnabas prisoner in the coffin and taking an oral history from him, which he plans to use as the basis of his next book. Longtime viewers of Dark Shadows are familiar with Barnabas’ native universe; the first 196 weeks of the show were set there. As Will put chains on Barnabas’ coffin in the hope of finding a fortune in his stories, Will’s counterpart, dangerously unstable ruffian Willie Loomis, took the chains off Barnabas’ coffin in hopes of finding a fortune in jewels. In his universe, Barnabas is the master of the Old House and he keeps his coffin in the space where Will has it here. It has occasionally been opened by intruders; the first time we saw that happen was in #275, when Willie’s sometime friend, seagoing con man Jason McGuire, lifted the lid at sunset, only to be greeted by Barnabas’ hand darting out and crushing his throat. If Cyrus gets the coffin open, Gladstone’s death might be avenged sooner than anyone could expect.
Gladstone’s death marks the final appearance of John Harkins. Harkins’ first appearance was in #174, in which he played Lieutenant Costa of the Arizona State Police. The most famous of his dozens of screen roles was in The Mary Tyler Moore Show, when he played the clergyman who officiates at the funeral of Chuckles the Clown. He also had a recurring role on Cagney & Lacey as Mansfield the drug kingpin. Harkins didn’t have any scenes with John Karlen, who was a regular both on that show and on Dark Shadows.
The Dark Shadows Wiki tells us that this is one of only six episodes with no cast member who appeared in 200 or more episodes. It lists the others as 168, 172, 180, 1141, and 1182. It also says that there is no one in it who joined the cast before David Selby’s debut as Quentin, but since Harkins was on almost two years before Mr Selby that is not so.
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