Quantum Leap -- American science fiction. [Jemma's too big of a Whovian to branch out into other speculative fiction. Alas.]

Because Dr. Beckett was essentially displaced into a time that wasn't his native space, he was the only one aware of the disturbance he created. Thus, when we stepped into a different time, we didn't stop being ourselves. Even if that time reflects a space where we've all ceased to be who we are.