A new team assembles to restart the Quantum Leap project. Lead physicist Ben Song takes an unauthorized leap into 1985 as the team scrambles to figure out what happened and how to get him back.

Ben finds himself headed into orbit aboard the Space Shuttle Atlantis in 1995. Addison confides to Ian about a discovery and finds herself at odds with Magic and Jenn.

Ben lands in 1979 Chicago as Jack Armstrong, a devoted security guard to talented pop singer Carly Farmer. During Carly’s prep for a concert, it quickly becomes clear her life is in danger and Ben must determine who is trying to kill her and why.

When Ben leaps into one of five people in an elevator at a 1962 nuclear reactor, he must figure which one triggers a bomb that kills them all. Each time the bomb goes off, he leaps into another one of them an hour earlier, resetting the scene.

Ben finds himself in 2012 in the midst of the Mendéz family as they help their transgender daughter, Gia, who dreams of playing on her high school basketball team. Magic and Jenn discover another piece of the puzzle of why Ben leapt in the first place.