A profile of the astronauts, crew, and civilians who were involved in the January 28, 1986 flight of the spaceship, Challenger, that resulted in its explosion upon takeoff. The center point of the film is the safety inspections and arguments surrounding the use of the o-rings that ultimately were blamed for the explosion.

Theorizing that one could time travel within his own lifetime, Dr. Sam Beckett stepped into the Quantum Leap accelerator and vanished... He woke to find himself trapped in the past, facing mirror images that were not his own and driven by an unknown force to change history for the better. His only guide on this journey is Al, an observer from his own time, who appears in the form of a hologram that only Sam can see and hear. And so Dr. Beckett finds himself leaping from life to life, striving to put right what once went wrong and hoping each time that his next leap will be the leap home.

A boy kidnapped by two mismatched hitmen puts them at each other's throats while being driven to their employers, possibly to be killed. Cohen, an older professional becomes increasingly irritated with his partner Tate, a brutish killer, when their prisoner uses unnatural guile and resourcefulness to play them off against each other.