In which film is Tony Manero a character?

In which film is Danny Zuko a character? Who played Sandy Olsson in 'Grease'? In which film is Sandy Olsson a character? Who played Tony Manero in 'Saturday Night Fever'? Who played Johnny Castle in 'Dirty Dancing'? Who played Frances "Baby" Houseman in 'Dirty Dancing'? Who played Sam Wheat in 'Ghost'? Who played Oda Mae Brown in 'Ghost'?