 Determined to prove he can become a scarer , Mike breaks into the school 's door lab and enters a door to the human world leading to a summer camp , but he is unable to scare a cabin full of children and runs off into the woods . Meanwhile , Roar Omega Roar offers to reinstate Sulley , but he refuses , instead confessing to Hardscrabble that he cheated , just as she is alerted of Mike 's break @-@ in . Realizing what happened , Sulley defies Hardscrabble and enters the same door to find Mike . After reconciling , they try to return , but are unable to exit after Hardscrabble deactivates the door while waiting for the authorities to arrive . Pursued by camp rangers , Mike realizes that the only way to escape is to generate enough scream energy to power the door from their side . Working together , Sulley and Mike terrify the camp rangers and generate an overwhelming amount of scream energy to return to the lab seconds before the device overloads and explodes in front of Hardscrabble . 
