Quantum Leap1989

[Sam has leapt into Captain John Beckett, a soldier during the American Civil War]

Dr. Sam Beckett:
Al, there was a John Beckett in my family. And he fought in the Civil War. He... he was my great-grandfather. I'm my great-grandfather? My great-grandfather fought with the Union forces in the Civil War. His name was John Beckett. My dad was named after him. [he shows Al his written orders]

Admiral Al Calavicci:
Yeah, Captain John Beckett.

Dr. Sam Beckett:
That'd explain this. It's the only reason I can figure out why I could leap outside my own lifetime.

Admiral Al Calavicci:
Must've been some kind of genetic transfer or something.