sentences:  In the movie version of "Grease", Travolta and Newton-John played the lead roles of Danny Zuko and Sandy Olsson.The song's genesis stems from a summertime love affair between Danny and Sandy, which had ended upon Sandy's revelation that she was moving back to Australia with her family.However, Sandy soon learns that her family is staying in the United States and subsequently enrolls at Rydell High School, where Danny is also a student.