Natural food like fruits, vegetables and meat among others are now extinct. Earth is over populated and New York City has 40 million starving, poverty stricken people.
The only way they survive is with water rations and eating a mysterious food called Soylent Green with an unidentifiable source.
When a detective investigates the murder of the president of the Soylent Green company he uncovers the truth about the disturbing secret ingredient of Soylent Green.