One of the most beloved ’80s horror movies turns 30 today.

Universal may currently be having a tough time uniting their iconic monsters into a shared universe, but back in 1987, Fred Dekker seemed to do it with relative ease.

Written by Shane Black and Fred Dekker, and directed by Dekker, The Monster Squad (unofficially) brought together Frankenstein, the Mummy, the Wolf Man, the Gill Man and Dracula, pitting them up against the only united front that seemed capable of vanquishing true evil back in the ’80s: a group of adventurous kids, of course.

The Monster Squad was released on August 14, 1987, but the film’s big premiere party is what we’re here to talk about today. According to Getty Images, the party took place on June 3, 1987 at the Hard Rock Cafe in New York City, and it was attended by more than just the cast and crew. In fact, it was a who’s who of Hollywood stars at the time.

Not only did actors attend the party dressed as the film’s five monsters, but so too did the likes of Michael Douglas, Kiefer Sutherland, Arnold Schwarzenegger, Meatloaf, Drew Barrymore and Kirk Cameron! As for young star Andre Gower, he partied with Hollywood’s elite while rocking his red “Stephen King Rules” t-shirt.

To be a fly on the wall of that party, huh?

Check out some awesome photographs from the coolest premiere party ever below, via the retro blog Branded in the ’80s. And see more over on Getty Images!