Pošasti Miha Očnik in kosmatinec Sulley delata v podjetju Strahovlad, d. d., največji centrali energije iz otroških krikov, ki napaja celotno deželo pošasti Strahovo. Ko človeška deklica po pomoti zaide v Strahovo, zavlada nepopisna panika.
Ever since he was a kid, Tylor Tuskmon has dreamed of becoming a Scarer just like his idol James P. Sullivan, and now that dream is about to come true... or not. The day he arrives at Monsters Incorporated to begin his dream job as a Scarer, he learns that scaring is out and laughter is in! After being reassigned to the Monsters, Inc. Facilities Team, Tylor sets his sights on a new goal: figuring out how to be funny and becoming a Jokester.
