- Walter Matthau as Lt. Zachary "Z" Garber
- Robert Shaw as Bernard "Mr. Blue" Ryder
- Martin Balsam as Harold "Mr. Green" Longman
- Héctor Elizondo as Giuseppe "Mr. Grey" Benvenuto
- Earl Hindman as George "Mr. Brown" Steever
- James Broderick as Denny Doyle
- Dick O'Neill as Frank Correll
- Lee Wallace as The Mayor
- Tony Roberts as Deputy Mayor Warren LaSalle
- Doris Roberts as Jessie, the Mayor's Wife
- Jerry Stiller as Lt. Rico Patrone
- Nathan George as Ptl. James
- Tom Pedi as Caz Dolowicz
- Beatrice Winde as Mrs. Jenkins
- Rudy Bond as Police Commissioner
- Kenneth McMillan as Borough Commander
- Julius Harris as Inspector Daniels
- Ruth Attaway as Mayor's Nurse
- Thomas Barbour as T.A. Chairman
- Marvin Silbersher as Comptroller
- Timothy Meyers as Plumber
- Conrad Yama as Mr. Tomashita
- Sho Onodera as Mr. Matsumoto
- Toru Nagai as Mr. Yashimura
- Tura Nakamura as Mr. Nakabashi
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- The Hostages
- Cynthia Belgrave as The Maid
- Anna Berger as The Mother
- Gary Bolling as The Homosexual
- Carol Cole as The Secretary
- Alex Colon as The Delivery Boy
- Joe Fields as The Salesman
- Mari Gorman as The Hooker
- Michael Gorrin as The Old Man
- Thomas La Fleur as The Older Son
- María Landa as The Spanish Woman
- Louise Larabee as The Alcoholic
- George Lee Miles as The Pimp
- Carolyn Nelson as Coed #1
- Eric O'Hanian as The Younger Son
- Lucy Saroyan as Coed #2
- William Snickowski as The Hippie
- Barry Snyder as The W.A.S.P.
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