Harold Ramis (Dr. Egon Spengler), Brian Doyle-Murray (Psychiatrist (as Brian Doyle Murray)), Peter MacNicol (Dr. Janosz Poha), Page Leong (Spengler's Assistant), Wilhelm von Homburg (Vigo), Annie Potts (Janine Melnitz), Rick Moranis (Louis Tully), Walter Flanagan (Rudy, the Museum Guard), Aaron Lustig (Norman the Producer), Richard Foronjy (Con Ed Supervisor Fianella), Chloe Webb (Elaine), Jason Reitman (Brownstone Boy #2), Yvette Cruise (Maria, Dana's Maid), David Margulies (Mayor Lenny), Mary Ellen Trainor (Brownstone Mother), Ben Stein (Public Works Official), Bobby Brown (Mayor's Doorman (as Bobby Baresford Brown)), Robert Alan Beuth (Store Manager), Ralph Monaco (Police Sergeant), Michael P. Moran (Frank, the Doorman), Steve Baker (Telephone man), Susan Boehm (Young Woman on Crutches), Ron Cummins (Police Lieutenant), Angelo Dimascio (Restaurant Cop #2 (as Angelo Di Mascio)), Dave Florek (First Cop), George Gerard (Man in Cab), Ray Glanzmann (Detective #2), John Hammil (Detective #1), Erik Holland (Fire Commissioner), Henry J. Deutschendorf II (Baby Oscar (as Hank Deutschendorf)), Sharon Kramer (Stenographer), Mordecai Lawner (Man with a Ticket), Christopher Neame (Maitre D'), Judy Ovitz (Slimed Restaurant Patron), George P. Wilbur (Bailiff (as George Wilbur)), Valery Pappas (Arguing Couple), Kariim Ratcliff (Crowd Member), Ira S. Rosenstein (Stage Manager), Mark Schneider (Arguing Couple), Douglas Seale (Plaza Hotel Man), William T. Deutschendorf (Baby Oscar (as Will Deutschendorf)), Louise Troy (Woman with Fur Coat), Christopher Villaseñor (Brownstone Boy #1), Olivia Ward (Meter Maid), Alex Zimmerman (Detective #3)

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American Broadcasting Company (ABC), Columbia Pictures, Columbia Pictures Corporation, Columbia TriStar Films, Columbia TriStar Home Video, Columbia TriStar Italia, LK-TEL V�deo