Who played Sam Wheat in 'Ghost'?

Who played Tony Manero in 'Saturday Night Fever'? In which film is Tony Manero a character? Who played Johnny Castle in 'Dirty Dancing'? Who played Frances "Baby" Houseman in 'Dirty Dancing'? Who played Oda Mae Brown in 'Ghost'? In which film is Oda Mae Brown a character? Who played Vivian Ward in 'Pretty Woman'? In which film is Vivian Ward a character?