Marlon Brando portrayed Sky Masterson in the 1955 film Guys and Dolls .
Sky Masterson is a character created by Damon Runyon and loosely based on Runyon 's close friend Bat Masterson .
Marlon Brando portrayed Sky Masterson , a character created by Damon Runyon and loosely based on Runyon 's close friend Bat Masterson , in the 1955 film Guys and Dolls .