I kept thinking this is very much like the original Quantum Leap. Then it hit me, Ben Song has leaped outside of his lifetime. He has gone back to 1962. A time when President Kennedy foresees a race for space.
Ben thinks he is in this element with this leap. He has ended up in a new kind of nuclear reactor which is having a promotional push.
Only this promotional push goes sideways, the reactor explodes and the US military covered up the deaths.
At first Addison is distraught over Ben's death but it then turns out he is alive. He has been caught somehow in a time loop but it is a finite one.
Ben leaps into another of the five people in the room in the nuclear reactor. He has to figure out who caused the explosion and stop it.
There is a wonderful simplicity to the story and this is nicely done. Well produced and brought to the screen.