A group of teenagers in San Francisco discover a nest of homicidal monsters living in a tower of the Golden Gate Bridge, but when they try to tell authorities, no one believes them. Clyde Hayes,Leilani Sarelle,Donna Locke,Victor Brandt,David Muir,Marta Kober,P.R. Paul,Jeff Tyler,Amber Denyse Austin,James Acheson,Chuck Hemingway,Bo Sabato,Jessie Lawrence Ferguson,John Lafayette,Gene Bicknell,Katherine Heard,Frank X. Baleno,Elizabeth Lauren,Trish Doolan,Teri Ralston,Dick Frattali,Cynthia Sprink,Anthony Henderson,Shari Moskau,Cooper Neal,Lydia Weiss,Betty Vaughan,T.J. Snell,Matthew Asner,Clarke Coleman,Shawn Lieber,Tom Noble,Alfred Boyer,Susanne Mierisch,Joseph Shirley,Barry Buchanan,Scott McKenna,Douglas Markell,James H. Smith,Mark Twogood,Andrew Divoff,Robert E. Veilliux,Scott Guetzkow,Chuck Cohen,Zac Baldwin,Solly Marx,Doyle McCurley,Mario Valdez,Jerome L. Dennae,Kathy Hooker,Chuck Secor,Daniel Burrell,Joel-Steven Hammond,Allan Aperlo