All 26 episodes from the 1970 children's series originally dreamed up by Ruth Boswell ('Tomorrow People'), in which two fifteen-year-olds, Liz (Cheryl Burfield) and Simon (Spencer Banks), travel through time. In 'The Wrong End of Time' (6 episodes), Liz and Simon travel back through time to a World War 2 naval base, where they are arrested on suspicion of spying. In 'The Time of the Ice Box' (6 episodes), Liz and Simon try to get back to the present, but instead they find themselves in an Arctic wasteland in the year 1990, where scientists in an underground research base try to involve them in a series of bizarre and destructive experiments. 'The Year of the Burn Up' (8 episodes) is a prescient portrayal of global warming. The children return to 1990 (but a different version as they have successfully managed to alter the past). They find the world ruled by the Technocrats, a scientifically advanced elite with a masterplan to reshape the world - but can they stop their destructive scheme that could bring about the end of the world? In the last of the four storylines, 'The Day of the Clone' (6 episodes), the children return to the present day, but Liz is immediately kidnapped and Simon sets off to find her. His search leads him through the time barrier back to the government research centre, where he finds Liz, and the children uncover masterplans for the 'Ice Box' and the 'Burn Up' they fought so hard to destroy.