Sam leaps into an elderly man who likes his whiskey and tells tall tales. His former partner and fellow gunfighter shows up wanting recognition and revenge.
As a New York City cab driver, Sam has to win a contest to get his own taxi medallion. Sam also has the help of a woman named Angelita who knows about Sam and claims to be an angel.
Sam's leap takes a dramatic turn when he begins leaping randomly throughout the life of Lee Harvey Oswald, accused assassin of President John F. Kennedy. Matters are complicated further when Sam's mind becomes tangled with Oswald's.
As the date for Dallas draws nearer, Oswald's personality is getting harder to control. Al is finding it harder to connect with Sam. Is Sam supposed to save the President, or unearth the conspiracy?