“Halloween Horror Nights” at Universal Studios Hollywood got off to a terrifying start as Hollywood celebrities paraded along the red carpet to celebrate Southern California’s most extreme Halloween event.

Attending celebrity guests included Jessica Rothe (Happy Death Day), Israel Broussard (Happy Death Day), Tobin Bell (SAW franchise), Leigh Whannell (Insidious, SAW), Blumhouse Productions’ Jason Blum (Happy Death Day, Insidious, Get Out), Frank Grillo (The Purge: Anarchy, The Purge: Election Year); Matthew Passmore (JIGSAW), Jennifer Tilly (Child’s Play), Tom Payne (“The Walking Dead”), Emily Kinney (“The Walking Dead”), Jabbawockeez, Slash (Musician), Christian Navarro (“13 Reasons Why”), David Arquette (Scream), Vanessa Hudgens (“Powerless”), Guillermo Diaz (“Scandal”), Jaime Camil (“Jane the Virgin”), Jordan Clarkson (LA Lakers, NBA Player), Lisa Edelstein (“Girlfriends’ Guide to Divorce), and John Murdy, Creative Director at Universal Studios Hollywood and Executive Producer of “Halloween Horror Nights,” among others.