Quantum Leap (season 4)

Sam and Al switch roles after a lightning strike. This allows Sam to return home to his wife, Dr. Donna Eleese (Mimi Kuzyk) – whom he had forgotten, as a side effect of leaping. Al leaps into Captain Tom Jarrett (Dean Denton), returned after three years in a Nazi P.O.W. camp, and is set to be killed by the jealous ex-fiancé (Robert Prescott) of his hometown sweetheart, Suzanne (Amanda Wyss). Sam must act as his hologram in order to save Al and continue to leap through time.

Sam leaps into a man named Clyde (played by Glenn Edden) just as he is about to join the KKK, out of respect for the racist family he has married into. He must prevent Black civil rights leader Nathaniel from being lynched by the Klan, as well as trying to explain to his host's son the evils of racism. Due to Sam's upbringing, he finds it very difficult to act like the person he has leaped into in order to "act behind enemy lines".

Sam is Frank Bianca (Robert Jacobs), a male hair stylist living with his girlfriend, Laura (Doran Clark), and her son Kyle (Joseph Gordon-Levitt). When Kyle witnesses the murder of a mall drugstore clerk just as Sam leaps in, Laura won't let him tell the police what he saw, and the killer is getting closer and closer to make sure that he never will.

Sam leaps into Katie McBain (Cheryl Pollak), a woman who has just been raped by the town's All-American boy (Matthew Sheehan). He must work with the prosecutor (Penny Peyser), herself a rape victim, to make sure that justice is done. To ensure Katie's testimony is accurate, she is brought into the Imaging Chamber to testify (relayed by Sam) at the rapist's trial.

In a very bizarre out-of-human host, Sam leaps into Bobo, an astro-chimp whom he must get into the space program, with the help of Dr. Ashton (Caroline Goodall), who manages the Astro-chimp program. If not, Bobo will die in a meaningless helmet test run by Dr. Winger (Gary Swanson), whose method is based on an incorrect hypothesis.

As a rash of serial murders take place in San Francisco, Sam leaps into a television reporter named Dylan Powell (Harker Wade) who must prevent Tamlyn Matsuda (Tamlyn Tomita), a psychic who is helping the police, from becoming the next victim. But when she discovers who Sam really is, they fall for each other and the ordeal becomes very personal. Al helps Sam catch a killer, but the serial killer remains on the loose, so Sam and his host's cameraman, Ross Tyler (James Handy), continue to pursue the story.

Sam is Roberto Gutierrez (Andrew Roa), a Geraldo Rivera-inspired talk-show host who works with his co-worker, Jani Eisenberg (DeLane Matthews), to unmask a local fertilizer and pesticide plant that is researching and producing chemical weapons before they're silenced.

Sam is a New York City taxicab driver named Max Greenman (Ross Partridge) who's trying to earn enough money to get his and father, Lenny (Jerry Adler), their own taxi medallion. Along the way, his cab runs over Angela (Liz Torres), who is completely unhurt. Angela claims to be an angel and can see Al, pretending to believe him to be the devil.