Good pilot episode with an interesting story that requires some backstory, which I assume we will get in future episodes.
Other reviewers have mentioned Quantum Leap, but in this episode (series perhaps) the main character, Dan, makes time jumps back to his own time. He may look slightly older, but the people from the past still recognise him and he interacts with them, with his brother, his fiance (who died in real time) and his future wife. That makes keeping track of the storyline a bit more complicated (blink and you no longer are sue ' when' he is) but it also makes it more interesting..
Looking forward to the next episode.