Reluctant time traveler Sam Beckett (Scott Bakula) continues "leaping" in and out of other people's bodies, for purposes apparently known only to his holographic advisor-observer, Al (Dean Stockwell), in season four of Quantum Leap. The season opener, "The Leap Back: June 15, 1945," offers the bizarro situation of Sam being stuck in the present while Al is forced to become the time traveler! Further perils and challenges await Sam as he assumes the form of a KKK member in "Justice: May 11, 1965," a young female rape victim in "Raped: June 20, 1980," and a member of a girl singing trio in "A Song for the Soul: April 7, 1963." He also finds himself the recipient of someone else's guardian angel (whom Al can see) in "It's a Wonderful Leap: May 10, 1958." Sam's most daunting "assignment" occurs when he is relocated into the body of a chimpanzee -- with a chimpanzee's intellect -- in "The Wrong Stuff: January 24, 1961." The final episode of the season, "A Leap for Liza: June 25, 1957," has Sam leaping into the body of the young Al. In so doing, he inadvertently breaks the rules of his mission by changing the course of past history, thereby endangering not only himself but also countless others yet unborn.