The fifth and final season of Quantum Leap gets under way with the controversial two-part episode in which time traveler Sam Beckett (Scott Bakula) leaps into the body of Lee Harvey Oswald, thereby inaugurating a tortuous odyssey leading right up to the tragic events of November 22, 1963. Somehow surviving this experience, Sam goes on to assume the shape of a paraplegic Vietnam vet, and a serial killer whose "modern" self has just escaped from prison. In the episode "Deliver Us From Evil: March 19, 1966, Sam meets another time-traveler named Alia; and in "Trilogy, the series' only three-parter, Sam shows up as three different people in three crucial moments of a young girl's life -- but will he be able to save her from being condemned for a crime she did not commit? Not that the road is always bumpy and dangerous for Sam; in one of the series' goofier installments, he takes over the body of sex therapist Dr. Ruth Westheimer! Quantum Leap concludes with the enigmatic installment "Mirror Image: August 8, 1953, in which Sam shows up as "himself" on the day of his own birth, and in so doing finally learns the identify of the person who has been navigating his leaps through time and space -- and it isn't his constant companion and advisor, the holographic Al (Dean Stockwell).