Remember the original Time Machine and the Time Traveller's astonishing account of his journey to the far future when humanity had divided into two races -- the worker-bestial Morlocks and the elfin-sheep Eloi? Remember also that the Time Traveller went back to that future and never returned?
What happened to his Time Machine? Did it fall into the hands of the Morlocks and did they make use of it to return to the time and place of its origin -- the England of Wellsian days?
This is the completion of that epic story. This is what happened when the Time Machine came back with the Morlocks as its riders and London as their new hunting ground for human cattle!