A group of young mutants--humans with a genetic variation that gives them superpowers and makes them feared by the population at large--begin training at a school for heroes. Their studies are interrupted when they must rescue one of their number from a mad scientist who can enter others' dreams.
A girl, sent by her parents to live with her two eccentric aunts, finds out on her sixteenth birthday that she is a witch.
In 1960, seven outcast kids known as "The Losers' Club" fight an evil demon who poses as a child-killing clown. Thirty years later, they reunite to stop the demon once and for all when it returns to their hometown.