 Gordon decided that the most affecting and "X-Files"-like story should involve a time-traveler who "turns out to be you".Howard was inspired to make the main antagonist a regretful scientist after hearing the story of Manhattan Project physicist J. Robert Oppenheimer berating U.S. President Harry S. Truman for using atomic bombs on Hiroshima and Nagasaki in 1945.This prompted Gordon to rhetorically ask