- The episode starring Hammer's most prolific actor, Peter Cushing, as a pet store owner doing scientific experiments on an ex-con and his wife (Brian Cox and Elaine Donnelly).
- When Chuck Spillers is released from prison, he tells his wife Annie that he had been visited by an old man, Martin Blueck, along his sentence for robbing a safe, and Blueck had given some money for him to help a fresh start in life. On the next morning, Chuck pays a visit to Blueck in his pet shop to thank the support and is invited to work for him feeding his animals in his private zoo while he is traveling. Blueck explains that he trains animals, conditioning then to obey some signals. A couple of days later, Chuck sees a safe in the store, and decide to open it, being trapped in a weird situation and disclosing the truth about the sadistic Blueck.—Claudio Carvalho, Rio de Janeiro, Brazil
- Chuck Spillers (Brian Cox) is released from prison after serving two years for burglary, with the help of an elderly pet shop owner Martin Blueck (Peter Cushing), who also gives him money and offers him a job in his shop. Chuck and his wife Annie (Elaine Donnelly) are thrilled with the offer.
Martin runs shady experiments behind his store on captured wild animals to train them to become docile, thereby avoiding the need in future to cage them and make 'cageless' zoos. The animals are kept in open cages but the exits are electrified and the animals are conditioned to eat their food only after a bell is heard. If they fail to adhere to this, they are fatally electrocuted. Martin wants Chuck to manage the place for a few days while he is out of town. Chuck accepts but unfortunately greed gets the better of him again when he sees a large safe in the shop. Despite his wife's warnings, he tries to open it, only to fall through a trapdoor into a metal cell with no exit.
When Chuck doesn't come home, Annie goes to the pet shop but Martin says he hasn't seen him. She notices Chuck's coat at the store and immediately goes to the local police but they simply advise her to wait a while longer for his return before they act. Annie investigates the store at night and finds Chuck trapped in the cell, and runs to seek help. It is revealed that Martin is a former Nazi concentration camp official conducting bizarre experiments on human beings and animals and wanted to use Chuck as a human subject. Annie returns to help Chuck but is pushed into the cell by Martin, who closes the trapdoor. Martin observes the couple's activities and controls everything. The local police detective Aldrige (Anthony Carrick) visits the store but does not find anything. Martin finds the couple's house keys in Chuck's coat and visits their house.
As Chuck and Annie figure out what to do, an exit opens in the cell wall leading outside. However, it is electrified like all the other cages, by Martin to experiment and see if the captives will try to escape. They note that there are times when the electricity shuts off briefly. During one such moment, they rush through the exit and to freedom outside. Chuck goes back inside the store to confront Martin, but he finds that a black panther has managed to exit its cage and has cornered Martin who ends up falling into the cell himself via the trapdoor. The trapdoor closes, leaving Martin captive. Chuck and Annie return home, but on entering their house, the door shuts and the walls become electrified. Martin had wired the place during his visit and perhaps purposefully allowed them to escape as part of his experiments. The story ends with Chuck and Annie screaming for help from the outside, and Martin trapped in his own prison, with no one to hear his screams.
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