Quantum Leap

This is based on a scientific experiment (with a time machine) which goes a bit wrong. The main character Sam Beckett, leaps into different times, but never as himself (well he has leapt into himself as a child). He has leapt into women, children, you name it. He is there to right a wrong and cannot leap out again until he achieves this (with the assistance of his buddy Al, that only he can see).

Each time Sam leaps he hopes that it will be the leap home, I have been watching Quantum Leap for years but have never managed to see the first or the last episode (if there is one). So the full story of how it begins and ends I don't really know.

You will have to watch for yourself. It does sound confusing, but once you've watched it once it will all fall into place.