GREASE was released on June 16, 1978, but it's still as much of a feel-good classic now as it ever was.
Here, we look at the actors who played Rydell High's most memorable characters and where they are today.
Who was in the cast of the 1978 movie Grease?
Olivia Newton-John as Sandy Olsson
Olivia Newton-John was 29 when she scored the female role in Grease.
The Australian native nearly turned down the role.
She was anxious that she might be too old to play a high schooler and that she wouldn't be able to pull off an American accent.
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Filmmakers accommodated Olivia with a screen test with co-star John Travolta and adapted the musical's story so that Sandy had been holidaying with her Aussie family before moving to the States.
Songs from her 1972 hit album, Olivia, appeared in the movie, including You're the One That I Want and Hopelessly Devoted to You.
Inspired by Sandy's transformation in the movie, Olivia vamped up her pop career, later producing hits like Physical and Twist Of Fate.
After a career that spanned over five decades, including Grammy awards, an Emmy award, and over 100million record sales worldwide, the star died on August 8, 2022.
She'd been diagnosed with breast cancer in 1992, which she'd fought into remission, but which sadly came back.
Olivia was very open about her diagnosis and treatment and even opened the Olivia Newton-John Cancer Wellness & Research Centre in Melbourne, Australia.
Olivia was 73 years old when she died.
She is remembered as an animal rights and environmental activist, as well as for her activism surrounding breast cancer.
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John Travolta as Danny Zuko
John Travolta, born in Englewood, New Jersey, in 1954, was a 23-year-old heartthrob who was hot off his fame in the film Saturday Night Fever when he took the role of Danny Zuko in Grease.
Travolta was the perfect character to play Danny, who was a tough guy with a big heart.
Throughout the musical, Danny warms up to be a more sensitive type, while his love interest Sandy, embraces her wild side for him.
After Grease, he went on to star in Urban Cowboy, Face/Off, Pulp Fiction, Get Shorty, The Thin Red Line, Battlefield Earth, and Hairspray.
More recently, he has impressed with his performance as Robert Shapiro in American Crime Story: The People vs OJ Simpson.
John is known in Hollywood as incredibly kind and genuine, who truly appreciates what fame has given him.
John has been married twice and had three children with his second wife, though tragically, his son Jett died aged 16 of a seizure in the Bahamas.
He then lost his wife, Kelly Preston, who, like Olivia Newton-John, died from a battle with breast cancer.
He continues to raise the couple's two living children, Ella and Ben.
His daughter called him her 'best friend' after the loss of her mother.
Stockard Channing as Betty Rizzo
Pink Ladies leader Rizzo was played by Stockard Channing, who at 32 was the oldest of all the actors playing the students.
She was a popular TV and movie actress at the time, known for her comic turns and portrayals of feisty women.
She had two numbers in Grease displaying her singing voice, but her moving portrayal of Rizzo's phantom pregnancy made her stand out, too.
Her success in Grease led to two US sitcoms being written based around her, and she won a Tony Award for her part in Broadway play A Day in the Death of Joe Egg.
Nowadays, Stockard is known for her TV roles in The Good Wife and The West Wing, the latter of which won her an Emmy.
She has been married and divorced several times but prefers her private life to be focused on her philanthropic work.
She is known as a leader in women's rights and environmentalism.
Jeff Conaway as Kenickie Murdoch
Jeff Conaway, who began his career in TV shows Happy Days, Taxi, and Babylon 5, is sadly one of the cast members no longer with us.
Having played Danny's second-in-command Kenickie, the original driver of Greased Lightning, former rock band frontman Jeff succumbed to drug addiction.
He fought the addiction throughout his life and, in the 2000s, went on US reality shows to try and get clean.
Part of his drug abuse was linked to a back injury sustained while filming the energetic routine for Greased Lightnin', which required painkillers.
The actor confessed to being in love with Olivia Newton-John during filming, and he went on to marry her sister, Rona, though they divorced in 1985.
He eventually married three times and died aged 60 of various causes, including pneumonia and encephalopathy, attributable to drug overdoses, in 2011.
Didi Conn as Francesca Alicia "Frenchy" Facciano
Frenchy was a pink-haired pal of Sandy who always showed her kindness when things got tough.
The character, who also showed up in Grease 2, was played by Didi Conn, whose real name is Edith Conn.
The film star also made a cameo in the recent US live TV production of Grease, the only lead of the original to do so.
Before Grease, she'd only been in one movie called You Light Up My Life.
But since the film came out, twice-married Didi has been in dozens of TV shows and movies, including Frida, Almost Summer, and Law & Order.
Didi's son has autism which has led her to become a spokeswoman for Autism Speaks, and she was a passionate supporter of former US President Barack Obama.
Michael Tucci as Sonny LaTierri
Michael Tucci had been in a sitcom and a horror movie when he bagged the role of T-Birds prankster Sonny in Grease.
He was 30 at the time, and his line "Come on guys, let's go for a slice of pizza" has to be one of the best of the film.
Eventually, his character charmed Marty Maraschino despite her rejecting him at the school dance.
You may now know Michael from the crime series Diagnosis: Murder and Melissa McCarthy's comedy The Heat.
He also starred alongside late comic Gary Shandling on his sitcom in the 80s.
Michael teaches Introduction to Fine Arts and Theater Arts at St. Francis High School in La Cañada Flintridge, California.
