'Timeslip' has a special hold on the memories of those children who saw it when it was first broadcast in the 70s, however it has been long gone...until now! When a young girl vanishes near a derelict naval station in St Oswald, a fantastic series of events is set in motion which sends teenagers Simon Randall and Liz Skinner backwards and forwards time.

The Wrong End Of Time Teenager Sarah enters a private but deserted Ministry of Defence field. Hearing a strange noise, she moves to a post where there had once been a tall fence. A farmer who has been sleeping in the field calls to her but she is mesmerised by the strange sound. She feels out to an invisible barrier and suddenly vanishes into it.

The Time Of The Ice Box An increasingly duplicitous Traynor convinces young Simon to return through the time barrier against the wishes of Liz's parents. When Liz follows him, the two time travellers find themselves mistaken for scientific guinea pigs at an Arctic research base twenty years in the future where the officious base commander is apparently on the verge of a nervous breakdown.

The Year Of The Burn Up Escaping from the dying icebox, Simon and Liz are transported by the time barrier to an alternate 1990 where a technocratic society's misuse of scientific progress has resulted in the breakdown of the planet's climate. As the earth faces destruction from the growing heat, Simon is forced to confront not just his own personal future but also an elderly, schizophrenic Traynor bent on revenge against those who betrayed him.

The Day Of The Clone Returning to the present day, Liz is kidnapped. Simon's search for her leads him to the government research centre run by the Traynor. Escaping through the time barrier, the two teenagers find themselves back at the centre but five years in the past. There, they are surprised to discover not just Morgan C. Devereaux from the icebox but also a very different Charles Traynor.