7 'Grease' Facts You May Not Have Known

The John Travolta classic film could have been dramatically different.

— -- After its 1978 release, "Grease" became an instant cult classic.

But despite having been enjoyed by millions of fans, there are still stories about the making of the film that remain unpublicized.

Until now.

4. Elvis could have been in the film: Originally, Elvis was considered a possibility to play Teen Angel, but he died in 1977, when the movie was being made. Frankie Avalon won the part instead.

5. A few of the songs were added at the last minute: The movie was almost made without its title song, which was performed by Frankie Valli, as well as "Sandy," "Hopelessly Devoted to You" and the duet "You're the One That I Want," which was written by Newton-John's songwriter John Farrar. “He played it for me and said, ‘What do you think?’ I went, ‘Oh, God, it’s amazing.’ It just had this fantastic energy," she recalled.

7. A sequel other than "Grease 2" was conceptualized: Carr wanted to make a "Grease" sequel called "Summer School," which would have focused on Kenickie and Rizzo. Instead, "Grease 2" was made in 1982, though it was a commercial failure.