Sigourney WeaverDana Barrett
Harold RamisEgon Spengler
Annie PottsJanine Melnitz
William AthertonWalter Peck
Ernie HudsonWinston Zeddemore
Jennifer RunyonFemale Student
Michael EnsignHotel Manager
John RothmanLibrary Administrator
Roger GrimsbyRoger Grimsby
Casey KasemCasey Kasem (voice)
John RingFire Commissioner
Norman MatlockPolice Commissioner
Joe CirilloPolice Captain
Joe SchmiegPolice Seargeant
Reginald VelJohnsonJail Guard
Rhoda GemignaniReal Estate Woman
Murray RubinMan at Elevator
Patty FreedmanWoman at Party
Jean KasemTall Woman at Party
Frances E. NealyChambermaid
Christopher WynkoopTV Reporter
Winston MayBusinessman in Cab
Eda Reiss MerinLouis's Neighbor
Ric ManciniPoliceman at Apartment
Kathryn JanssenMrs. Van Hoffman
Cheryl BirchenfieldAnnette Fleming
Kymberly HerrinDream Ghost
Billy BryanStay Puft Marshmallow Man (uncredited)
Frankie ComoT-Shirt Vendor (uncredited)
Peter CostanzaMan Fleeing Marshmallow Man (uncredited)
John De BelloPatrolman Matthews (uncredited)
Paddi EdwardsGozer (voice) (uncredited)
Eldo Ray EstesRedheaded Man (uncredited)
Brute ForceHare Krishna acolyte (uncredited)
Debbie GibsonBirthday Girl in Tavern on the Green (uncredited)
Willow HaleStudent at Columbia University (uncredited)
Jon HaydenLibrary Patron (uncredited)
Ron JeremyMan Behind Barricade (uncredited)
Joseph MarzanoMan in Taxi (uncredited)
Joe MedjuckMan at Library (uncredited)
Danny NeroReporter (uncredited)
Frank Patton IIICity Hall Cop (uncredited)
Harrison RayTerror Dog (uncredited)
Ivan ReitmanZuul / Slimer (voice) (uncredited)
Frank RiversPrisoner (uncredited)
Mario TodiscoPrisoner (uncredited)
Bill WaltonBill Walton (uncredited)
Mark Bryan WilsonSlimer (uncredited)
George SasakiHotel Guest (uncredited)
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