Who directed 'Grease' (1978)?

In what year was 'Return of the Jedi' released? Who directed 'Close Encounters of the Third Kind' (1977)? In what year was 'Close Encounters of the Third Kind' released? In what year was 'Annie Hall' released? In what year was 'Grease' released? Who directed 'Saturday Night Fever' (1977)? In what year was 'Saturday Night Fever' released? In what year was 'Alien' released?