Final answer:
In the 1970s, women began starring in films as action heroes during the second wave of feminism.
Step-by-step explanation:
In the 1970s, women began starring in films as action heroes. This movement was part of the second wave of feminism, which focused on demanding social and economic equality with men. One of the notable films from this era is 'Alien' (1979), where Sigourney Weaver portrayed the iconic action hero, Ellen Ripley.