He reveals that the quartz construction of the time machine is suffused with a radioactive substance he calls Plattnerite for the mysterious benefactor who gave him the sample to study twenty years earlier, in 1871.

Britain's major cities are all encased in Domes, and with the contributions of Austrian expatriate Kurt Gödel, the government hopes to win the war by altering Germany's history conclusively.

Upon hearing this and what society would be like after the war (a pessimistic view mirroring Wells' own), the Time Traveler and Nebogipfel mount the vehicle and insert the Plattnerite.

When the Time-Car is ready, the Time Traveler joins Nebogipfel in a fifty-million year journey through which they see First London expand and develop colonies on the moon and in Earth orbit.

When the Time-Car finally stops due to depletion of its Plattnerite fuel, Nebogipfel and the Time Traveler are tended by a Universal Constructor, a life form (or lifeforms) composed of thousands of nanotechnological entities.

At this central point from where all matter and energy and timelines branch off, the Constructors apparently start a new history in which they become something even more grand and knowledgeable than before.

It is revealed that the Time Traveler himself is the mysterious stranger who gave his younger self the Plattnerite sample under the alias "Gottfried Plattner", and that because of this, the circle of causality is closed and thus, the whole multiplicity of histories which ends up creating the Constructors and their successors begins anew.

The Time Traveler then makes one final journey to AD 802,701, along his historical axis, and just barely saves Weena from the death she suffered before.

Before sealing the packet, the Time Traveler writes that he plans to go into the world of the Morlocks again, hopefully to return and add an appendix to the story.