John Travolta, Olivia Newton-John, Annette Charles, Didi Conn, and Michael Tucci in Grease (1978)

John Travolta, Olivia Newton-John, Barry Pearl, Michael Tucci, and Kelly Ward in Grease (1978)

John Travolta, Olivia Newton-John, and Allan Carr in Grease (1978)

John Travolta and Olivia Newton-John in Grease (1978)

Stockard Channing, Olivia Newton-John, Dinah Manoff, Didi Conn, and Jamie Donnelly in Grease (1978)

"Grease" John Travolta, Olivia Newton-John

"Grease" Jeff Conway, John Travolta, Olivia Newton-John, Stockard Channing

"Grease" Kelly Ward, Olivia Newton-John, John Travolta, Michael Tucci, Barry Pearl

"Grease" John Travolta, Olivia Newton-John, Jeff Conway, Stockard Channing, Didi Conn, Michael Tucci, Barry Pearl, Kelly Ward, Dinah Manoff

"Grease" John Travolta, Olivia Newton-John, Jeff Conaway

"Grease" Olivia Newton-John, John Travolta

Director Randal Kleiser (left) with Olivia Newton-John (center) and John Travolta (right) on the graduation carnival set.

Olivia Newton-John at an event for Grease (1978)

John Travolta, Jeff Conaway, Barry Pearl, Greg Rosatti, Michael Tucci, and Kelly Ward in Grease (1978)

John Travolta, Olivia Newton-John, Annette Charles, and Didi Conn in Grease (1978)

John Travolta, Jeff Conaway, Barry Pearl, Michael Tucci, and Kelly Ward in Grease (1978)

Stockard Channing, Jeff Conaway, Lorenzo Lamas, Susan Buckner, Edd Byrnes, Didi Conn, Eddie Deezen, and Michael Tucci in Grease (1978)

John Travolta, Stockard Channing, Olivia Newton-John, Jeff Conaway, Dinah Manoff, Didi Conn, Jamie Donnelly, Barry Pearl, Michael Tucci, and Kelly Ward in Grease (1978)

Michelle Pfeiffer, John Travolta, Olivia Newton-John, Maxwell Caulfield, Julianne Hough, and Aaron Tveit in Grease (1978)