Scientist Jonathan Singer stands on the verge of achieving his two greatest dreams: marriage to his soul mate Sally DeMille and the successful launch of The American Super Collider, the culmination of his cutting-edge research. But when an elderly man shows up at his apartment with irrefutable proof that he is also Dr. Jonathan Singer, Jonathan's ordered life spins wildly out of control. The old man claims to have traveled back from 40 years in the future. He makes a desperate plea - "To thine own self be true". But this self is telling him to destroy everything he's worked for.