It’s the film that catapulted Olivia Newton-John and John Travolta to fame and formed a lifelong friendship between the pair.

According to a report by Vanity Fair, the roles of Sandy and Danny nearly went to Carrie Fisher and Henry Winkler.

The article claims bosses at Paramount wanted Danny to be a gas station attendant played by Henry Winkler, the star of Happy Days.

It wasn’t until Grease producer Allan Carr was sitting opposite young Australian actress Olivia Newton-John at a dinner party that they found their Sandy.

Newton-John, an aspiring singer, had just starred in science-fiction bomb Toomorrow, and didn’t want to compromise her music career.

“I was very anxious about making another film, because my music career was going well,” Newton-John told Vanity Fair.

Carr and Kleiser fixed this by making Sandy an Australian and, in the end, Newton-John and Travolta had great chemistry.

“She had a brilliant voice, and I didn’t think t could be any more correct person for Sandy in the universe,” Travolta said.

Olivia Newton John