Dr. Ben Song celebrates his engagement to Addison Augustine, and receives mysterious texts during the party that lead him to make an unauthorized leap in the Project Accelerator.

In 2022, the new Project Quantum Leap (PQL) team tries to find out why Ben leapt, and to bring him back.

Ben leaps into 1979 Chicago as bodyguard Jack Armstrong, assigned to protect famous musician Carly Farmer from mysterious attempts on her life.

He and Nadia's siblings Dina (who prefers being called Dean) and Sarah find pieces of a map in their inherited items leading to a treasure in Mexico.

Rachel tells Ian that her boss Gideon Rydge knows there's a mole in his company, and Jenn reminds Ian their need in the past to find Ben, and that Gideon was the only person with money and access to make the quantum chip that made possible to retrace Ben.

Ben writes a letter to Hannah and asks Sarah to send it later, then realizes the hidden treasure was behind a family portrait.

In September 2021, Scott Bakula, who played main character Sam Beckett in the series, hinted that a reboot of the show was being considered, with creator Donald P. Bellisario returning in some capacity.

[39] A pilot episode was ordered by NBC the following January with plans for writers Steven Lilien and Bryan Wynbrandt to act as showrunners with executive producer Martin Gero and with original producer and writer Deborah Pratt.

[46] In September 2022, Bakula confirmed that he had been asked by producers to reprise his role as Sam Beckett in the revival but had ultimately decided to not be involved with the new series, saying in a statement on Instagram, "As the show has always been near and dear to my heart, it was a very difficult decision to pass on the project".

[51] The final 5 episodes of the second season began filming on November 27, 2023, once the strikes had ended and there was time for pre-production.

[53] Raymond Lee was the first actor cast in the show, taking the lead role as Dr. Ben Song in March 2022.

[54] Shortly afterwards, the cast was filled out with Ernie Hudson, Nanrisa Lee, Mason Alexander Park, and Caitlin Bassett, making her television debut.

The website's critics consensus reads, "This more serialized reboot of Quantum Leap has enough heart to merit a look from viewers with the luxury of time, but it often forgets to have fun with the episodic structure that made the original a classic.