2044: The world is steeped in a planet-annihilating global war. The only way to save it is to travel backward in time. Bewildered maths teacher Murdo Ironside is recruited to join the League of Kairos, a secret agency for those few who possess the Time Gene, which confers the ability to turn back time.
But their powers are limited. They must join forces with other Time Travellers from the past, and build a network of chronomotives - trains running...