“We did it!…Did what?” Sam’s memory is so full of holes he doesn’t know his own name. What he knows for sure is that he isn’t Tom Stratton, an Air Force pilot set of break Mach 3 in an experimental supersonic aircraft.  He also knows that he can’t fly.  Dogging his movements is a mysterious man named Al, who no one else can see.  Al finally tells Sam that he is “part of a time-travel project that went a little ca-ca,” and that they are trying to get him home, and the best he can do in the meantime is to pretend he’s Tom Stratton until they can retrieve him.  An ex-astronaut, Al helps Sam fly the experimental aircraft then Sam finds he has to stop Stratton’s wife from delivering her baby prematurely. Next, he lands in a ballpark as a baseball player in his last professional game.  All he has to do is hit a pop fly or does he? 

Sam Leaps into Dr. Gerald Bryant, a boozed-out literature professor at Lawrence College in 1972. He’s there to extricate the professor from a shotgun wedding with Jamie Lee, a student with whom Bryant has been having an affair.  While on campus, Sam spots Donna Elesee, the woman he nearly married.  She walked out on the wedding, Sam recalls, because of a fear of commitment that he traced to her having been abandoned by her father when she was seven. Deliberately violating his own rules of time travel, Sam works to reunite Donna with her father in the hope that it will affect his own future. 

 As a boxer whose contract has just been acquired by a group of nuns, Sam must get himself into shape to win a championship fight so the nuns can build a new chapel.  Complicating matters is a sleazy promoter who expects Kid Cody/Sam to throw the match, and a girlfriend who wants the boxer to retire. 

 As a Texas Panhandle veterinarian, Sam finds he’s got more than sick animals on his hands when he’s challenged by tomboy Tess McGill to outrope, outride, outdrink and generally outdo her.  At stake is her hand in marriage and her father’s 50,000 acre spread. 

 After leaping into a rather compromising position, Sam finds out he’s Mafia hit man and the young lady is the godfather’s girlfriend.  Simply calling off the relationship is not an option, as Ziggy needs Sam to duplicate the events surrounding his Leap –in while they attempt to bring him home.  If Sam gets caught in the meantime, he’ll find himself singing soprano. 

As the driver for the widow of a former Alabama governor, Sam learns what it is like to be black in the segregationist South when he sits down at the whites only lunch counter.  While dealing with the repercussions from that incident, he must also make sure his employer does not die in an automobile accident. 

 Leaping into a nerdy boy with a crater-marked face, Sam has to stop the boy’s sister from marrying an abusive man. 

 Sam Leaps into a hard-boiled detective when could double for Bogart.  The only problem is he’s holding a gun over the body of his dead partner.  Who killed Phil Grimsley?  Was it his sultry widow Allison?  The nerdy newsboy Seymour?  Perhaps a “dropper” named Clapper?  Sam has to find out, or he could be next.