The leap back to the present day didn't go as planned. For physicist Ben Song (Raymond Lee), only a moment has passed since he was supposed to return home, but he's been missing for three years, and everything about Project Quantum Leap has changed. Now locked into a timeline where his former fiancee Addison (Caitlin Bassett) has a new love interest and the rest of his disbanded support team is scattered, Ben's time-traveling adventures face astonishing new challenges while he leaps into lives including a bounty hunter, a treasure seeker, a UFO investigator, a woman accused of witchcraft, and a professor searching for Albert Einstein's lost formula. During his centuries-spanning journey, Ben picks up a surprising new partner and exposes history-altering secrets as Quantum Leap's thrilling second season hurtles toward an unexpected conclusion.