American computer-animated comedy film directed by Pete Doctor, produced by Paxar Animation Studios and released by Walt Disney Pictures. Co-directed by Lee enrich and David Silverman, the film centers around two monsters employed at the titular Monsters, Inc. : top scares James P. “Sullen” Sullivan (John Goodman), and his one-eyed assistant and best friend, Mike Waxworks (Billy Crystal). Monsters, Inc. Employees generate their city’s power by targeting and scaring children, but they are themselves afraid that the children may contaminate them; when one child enters Monstrosity, Mike and Sullen must return her.
Doctor began developing the film in 1996 and wrote the story with Jill Occult, Jeff Pigeon, and Ralph Gleeson. Fellow Paxar director Andrew Stanton wrote the screenplay with screenwriter Daniel Gorgon. The characters went through many incarnations over the film’s five-year production process. The technical team and animators found new ways to render fur and cloth realistically for the film. Randy Newman, who composed the music for Pixie’s three prior films, returned to compose its fourth.
Although the film suffered from two lawsuits against the filmmakers, filed by Lori Madrid before the film’s release and Stanley Mouse in 2002 respectively, that were ultimately dismissed, Monsters, Inc. Was praised by critics and proved to be a major box office success from its release on November 2, 2001 , generating over $562 million worldwide.  Monsters, Inc. Saw a AD re-release in theaters on December 19, 2012. Its prequel, Monsters University, directed by Dan Cannon, was released on June 21, 2013.
The city of Monstrosity is inhabited by monsters and ordered by the screams of children in the human world. At the Monsters, Inc. Factory, employees called “Scares” venture into children’s bedrooms to scare them and collect their screams, using closet doors as portals. This is considered a dangerous task since the monsters believe that children are toxic and touching them would be fatal. However, production is falling as children are becoming harder to scare, and company chairman Henry J. Waterborne Ill is determined to find a solution. The top Scares is James P. Sullen” Sullivan, who lives with his assistant and best friend Mike Waxworks ND has a rivalry with the ever-determined chameleon-like monster Randall Bogs. During an ordinary day’s work on the “Scarecrows”, fellow Scares George Sanderson accidentally brings a child’s sock into the factory, causing the Child Detection Agency (CAD) to arrive and cleanse him. Mike is harassed by Orzo the clerk for never completing his paperwork on time. While going to file Mike’s paperwork, Sullen discovers that Randall left an activated door on the Scarecrows in an apparent attempt to cheat, and a young girl has entered the factory, much to Gulley’s horror.
After a few failed attempts to put her back, he places her in a bag and hides when Randall arrives and returns the door to storage. Mike and his girlfriend Celia are on a date at Hoarseness’s when Sullen comes to him for help, but chaos erupts when the girl is discovered in the restaurant, and the CAD is called. Sullen and Mike escape the CAD and take the girl home, discovering that she is not toxic after all. Sullen quickly grows attached to the girl and names her “Boo”. The next day, they smuggle her into the factory, and Mike attempts to return her through her door.
Randall tries to kidnap Boo but kidnaps Mike by mistake. In the basement, Randall reveals to Mike he has built a torture machine, the “Scream Extractor”, to extract children’s screams, which would make the company’s current tactics redundant. Randall straps Mike to the chair for experimentation, but Sullen stops Randall from using the machine on Mike and reports Randall to Waterborne. When Waterborne reveals that he is allied with Randall, he exiles Mike and Sullen to the Himalayas.
The two are taken in by the AbominTABLE Snowman, who tells them about a nearby village which Sullen realizes he can use to get back to the factory. Sullen heads out, but Mike, thinking that their current situation is Gulley’s fault out of disregarding his advice, refuses to follow him. Sullen returns to the factory and rescues Boo from the Scream Extractor. Mike returns to apologize to Sullen and inadvertently saves him from Randall. Randall pursues Mike and Sullen as they race to the factory and ride on the doors heading into storage, taking them into a giant vault where millions of closet doors are stored.
Boob’s laughter activates the doors and allows the chase to pass in and out of the unman world. After Boo conquers her fear of Randall to stop him from pushing Sullen out of an open door, Sullen and Mike trap Randall in the human world using a door to a Southern trailer park, where he is mistaken for an alligator and beaten up by a pair of hillbilly’s. Sullen and Mike are finally TABLE to access Boob’s door, but Waterborne and the CAD send it back to the Scarecrows. Mike distracts the CAD, while Sullen escapes with Boo and her door while an angry Waterborne follows.
Waterborne is tricked into confessing his plan to kidnap children in the simulation bedroom and is rested by the CAD, although Waterborne blames Sullen for putting the company out of business. The Coda’s leader, #001, is revealed to be Orzo, who has been undercover for two and a half years trying to prove there was a conspiracy at Monsters Inc. Sullen and Mike say goodbye to Boo and return her home, and on Roe’s orders Boob’s door is then shredded. Sullen becomes the new chairman of Monsters Inc. , and thanks to his experience with Boo, he comes up with a plan to end the energy crisis in Monstrosity.