第 4 季 共 22 集
播出时间：1991年9月19日
第 1 集 The Leap Back
播出时间：1991年9月19日
June 15, 1945: Struck by lightning, Sam and Al find their roles reversed, as Sam returns to the future, and to a long-lost love, while Al leaps back to 1945 to prevent the death of a returning World War II hero and his former girl friend.
第 2 集 Play Ball
播出时间：1991年9月26日
August 6, 1961: A pitcher on a minor league baseball team, Sam must decide if he's there to help a fellow team member, get his host back into the major leagues, or baby-sit the porcine team mascot, all while resisting the amorous advances of the women in his life.
第 3 集 Hurricane
播出时间：1991年10月3日
August 17, 1969: Sam meets Camille, and possibly a killer, when he leaps into a deputy sheriff in a small Mississippi town, lying in the path of a deadly hurricane.
第 4 集 Justice
播出时间：1991年10月10日
May 11, 1965: Sam must don the robe of a Ku Klux Klansman in order to save the life of an ambitious young civil rights leader, who is trying to register black voters.
第 5 集 Permanent Wave
播出时间：1991年10月17日
June 2, 1983: Sam leaps into Frank Bianca, a hairstylist in leather pants, to prevent the death of a young murder witness and his mother.
第 6 集 Raped
播出时间：1991年10月31日
June 20, 1980: It's up to Sam to try to bring a rapist to justice when he leaps into the perp's victim, a young woman who may have been unwilling to press charges against the young man - the son of the pillar of the community.
第 7 集 The Wrong Stuff
播出时间：1991年11月7日
January 24, 1961: The fates make a monkey out of Sam when he leaps into Bobo, an astro-chimp who must avoid succumbing to the experiments of an Air Force neurologist.
第 8 集 Dreams
播出时间：1991年11月14日
February 28, 1979: It's more like a nightmare when Sam leaps into a detective, investigating a gruesome murder. He may be next if he doesn't find out who eviscerated the victim and his only hope is the victim's catatonic son and her husband's psychiatrist. The horrific flashbacks he's experiencing don't help matters much either.
第 9 集 A Single Drop of Rain
播出时间：1991年11月21日
September 7, 1953: A devastating drought will be the ruin of a small town unless Sam, as Billy Beaumont, "purveyor of precipitation and maker of rain," can find a way to make it rain, while keeping his family together in the process.
第 10 集 Unchained
播出时间：1991年11月28日
November 2, 1956: Sam and a fellow convict named Boone are the defiant ones when Sam has to rescue his companion from a fifteen-year sentence on a chain gang.
第 11 集 The Play's the Thing
播出时间：1992年1月9日
September 9, 1969: May meets December when Sam leaps into a young actor in love with an older woman, who is also an aspiring singer. If he can't boost her confidence and help her get her career on track, she will face a "fate worse than death," returning with her son to Cleveland.
第 12 集 Running for Honor
播出时间：1992年1月16日
June 11, 1964: As a track star in a Navy college, Sam must prevent the death of his ex- roommate, who was expelled because he was gay, and who is slated to die at the hands of a group of bigoted cadets.
第 13 集 Temptation Eyes
播出时间：1992年1月23日
February 1, 1985: A serial killer stalks San Francisco while Sam as Dillion Powell, a TV reporter, protects a beautiful psychic who's working on the case, from becoming the next victim. The young lady is very clear of sight, as Sam and Al soon discover.
第 14 集 The Last Gunfighter
播出时间：1992年1月30日
November 28, 1957: Sam finds himself in the life of Tyler Meanes, a teller of tall tales who faces death at the hand of an old friend in a shootout at high noon.
第 15 集 A Song for the Soul
播出时间：1992年2月27日
April 7, 1963: As a backup singer in a black, amateur girl group Sam finds between the fifteen year-old lead singer and her father as he attempts to rescue the girl from a sleazy night club owner's clutches.
第 16 集 Ghost Ship
播出时间：1992年3月5日
August 13, 1956: Flying over the Bermuda Triangle, Sam, as the co-pilot, must prevent the flight from returning to Virginia, to get a seriously ill passenger to a doctor before she dies. Flying through the triangle is riskier than it seems, and Sam, deprived of Al's help when the hologram fades out, must get them through alive.
第 17 集 Roberto!
播出时间：1992年3月12日
January 27, 1982: Sam, as "Roberto!" is a tabloid talk show host a la Geraldo who, with an asthmatic rival and co-worker, tries to uncover a mystery at a local chemical plant, a mystery, which may prove to be deadly for his co-worker.
第 18 集 It's A Wonderful Leap
播出时间：1992年4月2日
May 10, 1958: Sam finds himself behind the wheel of a New York taxicab, in the life of Max Greenman, a driver striving to win his own tag, a license to drive his own cab. His mission is aided with the help of a woman who claims to be a guardian angel.
第 19 集 Moments to Live
播出时间：1992年4月9日
May 4, 1985: Sam is a soap opera heart surgeon and the obsession of a love-struck, if somewhat deranged fan. He must escape from the woman and her husband who kidnap him for reproductive purposes
第 20 集 The Curse of Ptah-Hotep
播出时间：1992年4月23日
March 2, 1957: It's almost as though Sam were on vacation when, as Egyptologist Dale Conway, he gets to read hieroglyphics, search lost tombs, and, of course, visit Egypt. But between an encroaching sandstorm, computer glitches back at the Project, the suspicious deaths of the guides, and a 3000-year-old curse to round things off, Sam has very little time to play in the sand.
第 21 集 Stand Up
播出时间：1992年5月14日
April 30, 1959: Sam, as the singing half of a comedy team, soon finds that trying to convince two people that they're truly in love is no laughing matter, especially when one of them is the object of a sleazy casino owner's desire.
第 22 集 A Leap for Lisa
播出时间：1992年5月21日
June 25, 1957: Sam leaps into Al Calavicci to prevent the death of his married lover. But when Sam accidentally alters history, and finds out too late about her untimely demise, it could mean the gas chamber for Al and disturbingly a whole new situation at Project Quantum Leap.
