Carol, a woman who hates insects, is unhappily married to Steve, an amateur entomologist. She secretly loves Steve's business partner, Larry, and would like to make their affair a permanent arrangement. One day while shopping, she encounters a gypsy who sells her something that will help her achieve her goal without leaving any traces. However, when Janet carries out her plan, she begins to be terrorized by a Death's Head moth, and discovers that things are seldom as simple as they seem, and that every action has its consequences. The series was retitled "Circle of Fear" beginning with this episode and no longer utilized the opening and closing segments featuring Sebastian Cabot as the host.

Terror ensues when Ellen Alexander wakes up alone in a hotel room, with no sign of her husband, Harry. Inquiries at the front desk yield the answer that he has checked out without her, and eventually lead her to Brett, who helps her find the answers she is seeking.

A widow is stalked by a vicious dog that once belonged to her late husband, but which now lives with a sinister neighbor. Even after the dog turns up poisoned, she believes it is still stalking her.

Janet inherits her mother's house when her mother dies in a mental institution. When she first arrives at the house, she meets her cousins Hattie and Jonathon, who welcome her warmly. She decides to stay at the house and fix it up so that it won't be condemned. However, neither the house nor Hattie and Jonathon are what they seem to be, and Janet begins to fear for her own sanity as a terrifying past merges with an equally terrifying present.

Co-eds are being murdered on a small university campus, all drained of their blood with two small marks on their necks. The late Professor Pendergast, who had been investigating the idea that vampirism is caused by a blood disease, has been sighted at two of the attacks.

A handsome rodeo star falls in love with a seductive young woman. With growing horror, he starts to realize that she is somehow connected to a series of deadly cougar attacks on the rodeo's crew.

When Grandpa arrives for a visit, he brings two special gifts for his granddaughter, Judy, a deaf mute. One's a special doll house, an exact replica of the one Judy lives in with her family; the other is the ability to "hear" his thoughts without speaking. But Grandpa's intentions aren't as benign as they seem. Will Judy be able to save her family before Grandpa destroys it?

Christina is a young woman with a twin sister, Lisa, whom she has never met. She hopes to meet Lisa on a visit home but is distressed to find out that Lisa has recently died. Christina begins to hear Lisa calling her at night and then starts to have visions of Lisa in an open grave. She tells her mother about this and discovers some unpleasant family secrets about Lisa. Does Lisa want revenge...or does she simply miss the sister she never had?

Bobby is a very bright but very sickly boy with a particular fondness for chess. As he starts fifth grade he is delighted to find that his teacher is the very popular Miss Gilden, with whom he forms a close friendship. Unfortunately, early in the school year, Bobby becomes too sick to go to school. After a short period of time, an alter-ego who looks exactly like Bobby appears and tells him not to worry, he will go to school for Bobby and come home and tell him what he has learned. Unfortunately, the alter ego terrorizes Miss Gilden, ultimately disgracing her and causing her death. As the alter-ego becomes stronger, Bobby becomes weaker until the alter-ego suggests that they play a game of chess to decide who should live as Bobby. With his life as the stakes, Bobby needs to best this evil version of himself. Assistance comes from an unexpected source.

Martha and Andrew Alcott own a vacation home where they spend their summers. Martha hates the house and, as the summer goes on, it appears she has good reason as there seems to be a malevolent force in the place that is strongest around the well in the basement. Events and scenes become ever more familiar as it becomes clear what the malevolent force is and what it intends to do with the lives of Martha and Andrew.

A young widow, trying to move on after her husband is shot down in Vietnam and presumed dead, begins to receive mysterious phone calls from a man who sounds like her late husband.

Paul, a recently divorced man, has a dream that his daughter Emily gets murdered as an adult. Believing it to be a premonition, he goes to the town where this will happen to see if he can prevent it. While there, he falls for Julie the owner of the boardinghouse where he is staying. It turns out that Julie is engaged to Ed, who turns out to be the man who murders Emily in Paul's vision. Chaos ensues as Paul and Ed end up fighting over Julie, and Ed ends up dead. Paul gets off by claiming the death was an accident, but Julie has one more nasty surprise waiting for Paul before he leaves town for good.

While on vacation, Ed Lucas presents his wife Kate with a souvenir of "The Concrete Captain," a small chunk of concrete with a miniature harpoon sticking out of it. Kate seems to be drawn to the item, continually picking it up and looking at it. Later, she is also drawn to a seaside inn where she and her husband hear the tale of the Concrete Captain and his wife, Katherine. But when Kate becomes ill and starts acting strangely, Ed wonders if the Concrete Captain hasn't returned to try to claim Kate as his own.

When Ranger Elliot Brent's pretty young wife Joanna complains of boredom, he buys her a television set. Unfortunately, she starts spending all of her time watching television, to the neglect of her household chores. One day, during an argument, Elliot accidentally kills Joanna. He buries her body in a shed behind his cabin. After that, he starts seeing images of Joanna being unfaithful on the television. One stormy night, a man shows up at the cabin seeking shelter, and Elliot recognizes him as the man Joanna was having an affair with. Elliot kills him, too. But will the dead stay quietly buried?