In a large, remote, coastal house, a mother and father read rhymes to their daughter. Downstairs, fourteen-year-old Rob is doing his homework. One by one the clocks stop and his parents vanish. Rob phones the local policeman and, seconds later, Sapphire and Steel arrive. They are menaced by Roundhead soldiers and images of plague victims. Sapphire becomes trapped in a painting and Steel reduces his body temperature to absolute zero to release her. Eventually, together with another elemental called Lead, they lure the enemy into the cellar. Here the force is crushed out of the foundations of the house by Lead. Sapphire and Steel disappear and the parents return as though they had never been gone.

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At a disused railway station, the Darkness is feeding upon the resentment of people who have died prematurely. These include a WWI private blown up on Armistice Day, three workers suffocated in an experimental submarine and a pilot killed one flight from being demobbed. Together with an old ghost-hunter called Tully, Sapphire and Steel attempt to contact the beings. Sapphire is taken-over by the Darkness and tries to kill Steel with a bunch of flowers! Steel finds himself trapped in barbed wire on a battlefield. Time is advanced twelve days and Steel offers a bargain to the Darkness conditional to it returning time to its proper course and freeing its victims. It accepts the last few years of Tully's life. This makes Time itself resentful thus providing the energy the Darkness needs.

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A couple from 1500 years in the future occupy an invisible time capsule atop a modern-day block of flats as part of an experiment. Time is resentful that, in the couple's home time-zone, man is the only animal not extinct. It begins to menace the couple and their baby with animal-derived products. The baby is made to age into an adult and given the power to age or regress material objects. Sapphire and Steel are joined by Silver and confront this changeling. Silver is sent into the future and Steel destroys the changeling reverting it back into a baby and returning Silver. The agents track down the source of the disturbance, an amalgamation of various types of organic matter, and Steel terminates the experiment.

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Sapphire and Steel investigate an old junk shop where the original landlord and a tenant have disappeared. The new landlord is a shapeless being who moves between time-zones via photographs and has the ability to imprison or release people from them. The agents find out that the Shape was originally released by the landlord's hobby of splicing together photographs from different periods. They discover the missing tenant, Ruth, trapped in a photograph, but the faceless Shape burns her alive within it. It then traps Sapphire and Steel and they are only saved by the bravery of a stripper called Liz. Eventually, the Shape is trapped in a kaleidoscope and placed on a sinking ship.

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Lord Arthur Mullrine organises a party to celebrate the fiftieth anniversary since his business partnership began with the late Dr George McDee. During the party, time rolls back fifty years and guests who were not alive at that time are systematically murdered. The late Doctor McDee arrives at the party and Sapphire and Steel realise that the events of the night of his death are beginning to recreate themselves. It transpires that McDee had invented a lethal virus that could destroy all humanity. However, before this could happen he was shot by a jealous lover. Time has occupied the body of the lover and is attempting to arrange events such that McDee survives to accidentally unleash the virus. Sapphire and Steel ensure that he is, indeed, killed by the lover and his body and the virus are consumed in a fire.

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Sapphire and Steel arrive at a deserted service station and meet Silver. A couple from 1948 arrive together with an old man from 1925 and a travelling player from 1957. The agents are suspicious as to the lack of interest shown by the couple in the modern trappings of the petrol station and the strange unused condition of the musician's tambourine. The strangers are revealed as Transient Beings, enemies of Sapphire and Steel, who have escaped entombment in the past using a device called a Time Box. They use a Time Box to trap Sapphire, Silver and Steel in the petrol station and the agents find themselves floating through the infinity of space: trapped forever.

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