George has a full-size time machine which he uses to travel ahead to September 13, 1917. He meets Filby's son, James, who tells him of Filby's death in a war. He then stops on June 19, 1940, during the Blitz, finding himself in the midst of "a new war". George resumes his journey and stops on August 18, 1966. People hurry into a fallout shelter amid the blare of air raid sirens. An elderly James Filby urges George to take cover. Moments later, a nuclear satellite explodes, causing a volcanic eruption. George narrowly makes it back to his machine ahead of the approaching lava, which rises, cools, and hardens, trapping him inside, as he travels far into the future. Eventually the lava wears away, revealing a lush, unspoiled landscape.