John Travolta Makes Surprise Appearance at Grease Sing-Along Event in L.A. — While Dressed Like Danny Zuko

John Travolta stepped back in time for a surprise appearance at a fan event.

The actor, 71, attended a Grease sing-along at the Hollywood Bowl in Los Angeles on Friday, June 27, when he was dressed as Danny Zuko, his iconic character from the 1978 film.

Travolta later posted a photo on his Instagram of himself as an older version of Zuko — sporting gray hair while wearing a black leather jacket and a T-shirt.

“Tonight at the Hollywood Bowl, for the first time I surprised everyone at the GREASE Sing-A-Long and dressed up as Danny Zuko,” he wrote in the post’s caption. “No one knew. Not even the cast. Thank you for a great evening.”

Travolta was joined at the event by fellow Grease cast members Barry Pearl, Michael Tucci, Kelly Ward and Didi Conn, plus director Randal Kleiser.

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Travolta also shared a video from the surprise moment in his post.

After walking to the stage to loud cheers from fans in the packed-out amphitheater, the father of three channeled Zuko and said to the audience, “L.A., I thought you were going back to Australia? That’s cool, that’s cool, baby. You know, riding and rollin’ and whatnot.”

He later told the crowd before him, “Enjoy the show. We love you!”

Grease is a musical film that follows a group of high school students in the 1950s. Some of its most popular songs include “Summer Nights,” “Hopelessly Devoted to You,” “Greased Lightnin’,” “We Go Together” and “You’re the One That I Want.”

Travolta starred opposite the late Olivia Newton-John in the film. (The actress died from breast cancer at age 73 in August 2022.)

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Back in 2019, Travolta and Newton-John dressed up as their Grease characters as they reunited at the Meet n’ Grease sing-along event at the Coral Sky Amphitheater in Florida.

Travolta told PEOPLE a year later that the reunion felt “awesome” and it was his idea for the pair to dress up as the characters.

“For whatever reason, like the bald head suits me, so does that ’50s get-up better than any other hairdo, so either I’m gonna go bald or wear a Danny ’50s hairdo. It suits my appearance,” he said.

“That movie is still loved … the excitement from the people, it was amazing. I couldn’t believe it, people still love it!” added Newton-John.