In a top-secret U.S. military laboratory, a freak explosion exposes unsuspecting janitor Harlan Williams (Keith Szarabajka) to fallout from toxic chemicals. Williams, an older man, soon finds the accident has reversed his aging process. But the government's plan to use him as a human guinea pig forces Williams to go on the run, setting off a nationwide manhunt. Horror writer Stephen King penned this gripping, made-for-television miniseries.