The four plays are independent of one another, apart from the linking character of the cage-keeper, Mr Jacob, and can therefore be performed separately or in any order. However, when performed together, the author recommends that they should be performed in the following order.
When Mr Smith expresses doubt that the Killer is in his cage by choice, the Killer removes one of the bars from his cage and steps out, scaring the couple intensely for fear of what he might do to them. The Killer continues to insist that he has been misrepresented and does not wish to do the couple harm, while nevertheless acting in a threatening manner.
After stroking Mrs Smith's hair to sooth her, an act which annoys Mr Smith, but about which he does nothing, she admits that she does not think the Killer is a killer. The Killer then challenges Mr Smith to put the bar back into the cage to show his strength, a challenge which Mr Smith fails. The Killer puts the bar back himself, shutting a panicked Mr Smith in the cage who starts shouting for help. The Killer then expresses to Mrs Smith that her husband appears to be a failure and has, in particular, failed to protect her from this killer. She subsequently rejects her husband for his failure.
Jacob returns and orders the Killer back into the cage at gunpoint. The Killer then proclaims to have succeeded in killing Mr and Mrs Smith and to boast that he can kill anybody, but still denying to have killed his family. After Jacob and the Smiths have left, the Killer's mood changes and he speaks to the audience, claiming that he is just doing his job and that both he and the audience are killers in cages.
After Jacob has left Miss Jones with the babies, she tries to engage them in conversation. Increasingly fractious arguments between the babies and Miss Jones culminate in Bluey and Yellow pulling a knife and a gun, respectively, from their underpants, although the babies refer to these weapons as a "kernife" and a "gum". Yellow says that he has his bum in his pants and then proceeds to pull out a bomb. Concerned for her safety, and believing she now knows how the parents were killed, she calls Mr Jacob who insists that the weapons are just toys but is then shot by Pinkie.
Jacob enters to warn the couple that they need to look cheerful for the visitors or they will lose their job. He also orders Mr Grey to have a wash since he smells. While Mr Grey is washing, Jacob propositions Mrs Grey, offering her a better life if she will have sexual intercourse with him. Once Mr Grey has finished washing, Mrs Grey challenges her husband to defend her honour, but he instead seeks to appease Mr Jacob in an effort to keep his job.
Jacob leaves to bring in the latest visitors and, in his absence, Mrs Grey further insults her husband, finally labelling him as pathetic. When Jacob returns with Mr and Mrs Brown, Mrs Grey ignores them while Mr Grey attempts to engage them in mindless banter. When questioned directly by the Browns, Mrs Grey launches into a tirade about how she is sick of her life, upsetting the Browns and leading Jacob to fire Mr and Mrs Grey. Mrs Grey leaves the cage with pleasure, while Mr Grey fights to maintain his position, to no avail.
Once the Greys have left, Jacob puts on an act of being in a desperate situation now his cage is empty. The Browns, currently unemployed, offer to step into the cage, with Mr Brown believing this to be their lucky day, while Mrs Brown is somewhat less certain. Jacob locks them into the cage and goes off to bring in the next visitor.
Once the Lovelys have left, the green man sings about his captivity and his desire for release, through death, in a form reminiscent of a spritual. Jacob catches him singing and beats him viciously for disobeying his orders never to speak or communicate.
As Jacob leaves, Helen Lovely returns to bring the green man some food and is happy to learn that he is able to speak. She unties his hands and tries to set him free using a hairpin to pick the lock of the cage. She touches him to see if the green comes off, but the green man explains that he is green as a result of genetics. After loosely tying his hands again, Helen leaves, promising to come back and visit.
The following morning, Jacob enters with a policeman who orders the green man to confess to the rape and murder of Helen Lovely. Helen had been found in Jacob's bedroom, having been shot with Jacob's gun. The green man is the only suspect, despite having been locked in a cage with his hands tied. Finding that the green man's hands are only loosely tied and that there are scratch marks from a hairpin around the lock on the cage door, the policman concludes that this is suffient evidence of the green man's guilt and leads him away.