Guess the movie.

In a land of monsters, ＊＊＊ is king. He and his coworker/ friend ＊＊＊ are two of many monsters that work for ＊＊＊. a utility company that generates power for a very paranoid and nervous city of monsters. This power, oddly enough, is generated from the screams of children, which is produced by scaring them in their sleep. One night, however, ＊＊＊ uncovers a devious plot to rid Monster city of it's power problems, but in all the wrong ways. Together, ironically, ＊＊＊ and ＊＊＊ will fight to protect the innocence of the children they scare every night.