Quantum Leap (1989)

S5E2 Lee Harvey Oswald (2)

After leaping once more before finishing his initial mission, Sam unexpectedly jumps back and forth through Lee Harvey Oswald's life. Embracing the theory that Oswald acted alone, Sam and Al work together to thwart Oswald's assassination attempt on John F. Kennedy. However, as each leap grants Oswald greater dominance over Sam's actions, the likelihood of repeating history appears increasingly inevitable.