Mad scientist Dr Lang is building a Frankenstein’s monster in the laboratory hidden in his house. Once the body is complete, he will drain the personality of recovering vampire Barnabas Collins into it. That is supposed to bring the creature to life and free Barnabas from vampirism forever.
As we open, Lang is preparing to harvest a head for the creature from the body of the man who had dug up the graves to supply the other parts. This man is, at the moment, still alive. His name is Peter, though for reasons of his own he wants to be called Jeff. Peter/ Jeff keeps waking up and complaining about his impending decapitation, to Lang’s surprisingly mild irritation.
Barnabas comes to the lab. He is afraid of a relapse into vampirism, but is having second thoughts about killing Peter/ Jeff. Lang works hard to talk him back into going along with his evil scheme. He asks Barnabas if he loves well-meaning governess Vicki. Barnabas says yes. First time viewers may be surprised that he doesn’t put much enthusiasm in that response; regular viewers, knowing that Barnabas has never shown any sign of being attracted to Vicki, will not. Lang says that if Peter/ Jeff goes free he will marry Vicki and they will live “a life of unending happiness!” Faced with this horrifying prospect, Barnabas agrees to let Lang butcher Peter/ Jeff.
Barnabas leaves the room and sees Vicki letting herself into Lang’s house. He hides from her, then sneaks back to the lab to tell Lang she is there. Lang goes to get rid of her. Barnabas eavesdrops on their conversation. We see the conflict on his face. He goes back to the lab, stands next to the table where the unconscious Peter/ Jeff is restrained, tells himself that Vicki will always love Peter/ Jeff, and studies one of Lang’s scalpels. For a moment it looks as if he will kill Peter/ Jeff himself, but instead he releases the restraints.
Lang comes back, and Barnabas quarrels with him. When Lang says that they can’t let Peter/ Jeff go knowing what he knows about them, Barnabas tells Lang that Julia Hoffman, the other mad scientist in town, has such potent abilities as a hypnotist that she can erase Peter/ Jeff’s memories. Lang refuses to involve Julia, and pulls a gun on Barnabas. After so many long years as an undead abomination, Barnabas sadly tells Lang that an ordinary bullet is no threat to him. Lang declares that, on the contrary, he is now sufficiently human to die of gunshot wounds.
Acilius on Dark Shadows 