John Travolta, who starred as 'Grease' bad boy heartthrob Danny Zuko, crashed the Hollywood Bowl's sing-along event Friday.

John Travolta pulled out the hair gel and leather to revive his role as Danny Zucco in a Hollywood Bowl screening of "Grease.

John Travolta's Danny Zuko reemerged at the Hollywood Bowl, 47 years after the star portrayed the Rydell High T-Bird in ...

Fans at the 'Grease' Sing-A-Long screening at the Hollywood Bowl last night got a surprise when the original Danny Zuko ...

John Travolta made a surprise appearance at Friday night’s “Grease” sing-a-long at the Hollywood Bowl dressed as his iconic ...

You never know what’s going to happen on those summer nights at the Hollywood Bowl. On Friday night, the iconic venue hosted ...

The Hollywood Bowl event was just getting underway when Travolta, who starred as 1950s greaser Danny Zuko in the 1978 film, ...

John Travolta, who starred as 'Grease' bad boy heartthrob Danny Zuko, crashed the Hollywood Bowl's sing-along event Friday. He surprised the audience and "Grease" co-stars alike.

John Travolta thrilled fans with a surprise appearance at the “Grease” Sing-A-Long at the Hollywood Bowl, dressed as his ...

The clip showed the “Pulp Fiction” alum walking out as the crowd went wild before Travolta joined his stunned “Grease” ...

Danny and Sandy finally get their movie-ending 'Grease' kiss, 40 years after it was cut Travolta wasn't the only "Grease" star who dropped in for the Hollywood Bowl showing.