Mr. Zero is the main protagonist and anti-hero of Elmer Rice's stage play The Adding Machine.
Mr. Zero is an accountant at a large, faceless company. After 25 years at his job, he discovers that he will be replaced by an adding machine. In anger and pain, he snaps and kills his boss. Mr. Zero is then tried for murder, is found guilty and hanged. He wakes up in a heaven-like setting known as the "Elysian Fields." Mr. Zero then begins to operate an adding machine until Lieutenant Charles (Louis Calvert), the boss of the Elysian Fields, comes to tell Zero that he is a waste of space and his soul is going to be sent back to the earth to be reused. The play ends with Zero following a very attractive girl named Hope (who may not actually exist) off stage.