Delve into the intricate world of algebraic geometry and superstring theory in this advanced lecture, the third part of a series exploring moduli of stable supercurves and the superstring measure. Over the course of nearly two hours, gain deep insights into the mathematical foundations underpinning these complex topics. Examine the properties of stable supercurves, analyze their moduli spaces, and investigate the connections to superstring theory. Explore the construction and properties of the superstring measure, a crucial element in understanding the quantum behavior of superstrings. This lecture, presented at the Galileo Galilei Institute, offers a rigorous mathematical treatment suitable for researchers and advanced students in theoretical physics and mathematics.