Kaz and Oliver revive a frozen-in-time superhero from the 1950s named Captain Atomic. After Captain Atomic is wounded during a battle with a contemporary villain, the boys must travel back in time to save him.

Kaz and Oliver are exhausted and stuck working the overnight shift during a lunar eclipse, when it is rumored that the freakiest patients come to the hospital. When Neocortex checks in with an illness that unintentionally traps people in their worst nightmares, Kaz and Oliver desperately try to stay awake and figure out how to save everyone from their nightmares.