The demonstration goes wrong and Colin (with his same memories) finds himself in a parallel universe with significant differences from our own: John F. Kennedy is Secretary General of a still-existent League of Nations, Leslie Howard did not die in the Second World War because it never happened, and no one ever succeeded in climbing to the peak of Mount Everest.
The demonstration fails, leading Colin to a parallel universe with notable differences from our own: John F. Kennedy serves as Secretary General of an ongoing League of Nations, Leslie Howard did not die in World War II because it never occurred, and no one has ever reached the summit of Mount Everest.