Monsters, Inc.

Monsters, Inc. is the power utility in Monstropolis, a city inhabited by monsters. The company sends its "scarers," monsters employed to frighten human children, to children's bedrooms around the world through individually-loaded and activated teleportation doors. Each door precisely matches a closet door in an individual child's bedroom. The scarers then frighten the children badly enough to cause them to scream. The screams are then captured through the portals and stored for later use in power generation for the monster world.It is understood, however, that the children themselves are toxic, and the company goes to great lengths to prevent contact with them; should a monster be touched by a child, or even by their belongings, the Child Detection Agency (CDA) is immediately alerted to sanitize the affected being. With growing numbers of children becoming desensitized by mass media, Monsters, Inc. CEO Henry J. Waternoose is finding it increasingly difficult to harvest enough scream to meet the power demands of Monstropolis. As a result, an energy crisis looms.One evening, James P. Sullivan ("Sulley"), Monsters, Inc.'s top scarer, finds a loaded door on the scare floor after hours - a violation of company policy. Peering inside, the child's room appears empty, so he exits. Sulley then finds to his horror, that a human girl has followed him through the door, thinking him to be a giant kitty. Terrified of contamination, he tries to return her, but is forced to hide when Randall Boggs, a competitive co-scarer, emerges from the child's room and surreptitiously sends her door back to the factory's door vault. Sulley quickly hides the child and gets hold of his work-partner and pal Mike Wazowski for help in figuring out the situation. At Sulley's home, they discover that being touched by the child is not harmful at all, and that when she laughs, nearby fields of electrical power surges to unusually high levels. Sulley nicknames the child "Boo" and becomes her caretaker until they can get her back home.Sulley and Mike disguise Boo as a baby monster and return to Monsters, Inc. the next morning. Mike puts in a request for retrieval of Boo's door, but the doorkeeper, Roz, denies it, as Mike has failed to properly file the previous day's paperwork. Boo wanders off into the plant, with Sulley giving chase. They accidentally stumble upon Randall and his "scream extractor", a device that extracts the screams directly from a physically restrained child. This requires Randall to actually kidnap children and bring them to the monster world.Sulley takes Boo and attempts to reveal Randall's actions to Waternoose, but is sidetracked by a demonstration of his scaring skills to new employees assembled at the plant's scare simulator before he can do so. When he scares the robot subject, Boo becomes frightened of him, and is revealed as a human. Sulley tries to explain the situation to Waternoose, but comes to realize that Waternoose is actually in on the scream extractor plan, and is allowing Randall to develop it in order to keep Monsters, Inc. from going out of business. To keep them quiet, Waternoose orders Sulley and Mike exiled to the human world, and gives Boo to Randall for use in the machine.Sulley and Mike, now stranded in the snowy Himalayas in Nepal with its local monster inhabitant, an ever-gleeful Yeti, realize that Boo's life is in danger. They find a nearby Nepali village and locate a door connected to Monsters, Inc.'s Scarefloor F, Mike and Sulley's daily workstation. They are just in time to save Boo from the extractor, and attempt to catch Randall, leading to a chase on, across, and through the myriad traveling portals within the cavernous automated door vault, all now activated by Boo's reverberating screams of delight. They triumph once Boo overcomes her fear of Randall and starts beating him with a Wiffleball bat. Sulley throws Randall through a door, and he and Mike then smash the door to pieces to prevent him returning.Sulley, Mike, and Boo then lure Waternoose into a trap at the scare simulator, and force him to reveal his intentions on camera. Under arrest by the CDA, the executive furiously blames Sulley for destroying the company and exacerbating the energy crisis. As he is taken away, Roz (now revealed to be Agent 001 of the CDA) insists that Boo must return to her world and that her door be destroyed. Sulley conveys Boo to her room and bid her farewell, and watches sadly as her door is run through a door shredder. Mike retrieves one undisposed-of splinter, and gives it to Sulley as a keepsake.Later, Sulley has become the new CEO of Monsters, Inc., and has changed the company's approach - instead of scaring children, they make them laugh. This generates ten times more power, making both monsters and children happy and ending all fears about the energy crisis. Mike then reveals his own special project to Sulley - he has managed to rebuild Boo's door save the one piece Sulley has kept, and invites him to finish it. Sulley places the last piece and enters the door, where an unseen Boo instantly recognizes him.