Visiting hours continue at Mighty Med, the secret superhero hospital where anything is possible. Kaz and Oliver are assigned to work the freaky overnight shift, Oliver opens a Mighty Med wormhole letting in a hero from 1953, and Kaz becomes convinced that his substitute teacher is a supervillain! And what could possibly go wrong when Horace asks Oliver and Skylar to pet-sit for the shark he keeps in the aquatic wing of the hospital? At Mighty Med, that’s just how they operate.