Woyzeck is the all-purpose servant of a German Captain. The Captain considers him amoral and stupid, largely because Woyzeck is poor. Woyzeck also makes money by allowing the Doctor to experiment on him. He has eaten nothing but peas in order to prove some unstated scientific premise.
Woyzeck discovers his girlfriend, Marie, with whom he has had a son, having an affair with the drum major. He brings Marie to the side of a pond and slits her throat. After getting drunk, Woyzeck realizes that people are looking at him suspiciously and he returns to the pond and presumably drowns himself.