Quantum Leap (1989)

Dr. Sam Beckett, a brilliant physicist, embarks on a groundbreaking experiment with time travel, but his leap into the Quantum Leap accelerator leads to unexpected consequences. He finds himself inhabiting the lives of others in various moments of the past, compelled to rectify their mistakes. Al, a holographic observer from Sam's own era, serves as his only source of guidance, visible and audible solely to him. Each leap presents new challenges as Sam aims to set things right, all while hoping that the next jump will finally bring him back to his own time.