| John Belushi | Captain Wild Bill Kelso |
| Dan Aykroyd | Sgt. Frank Tree |
| Lorraine Gary | Joan Douglas |
| Ned Beatty | Ward Douglas |
| Treat Williams | Corporal Chuck "Stretch" Sitarski |
| Nancy Allen | Donna Stratton |
| Robert Stack | Major General Joseph W. Stillwell |
| Tim Matheson | Captain Loomis Birkhead |
| ToshirĂ´ Mifune | Commander Akiro Mitamura |
| Christopher Lee | Captain Wolfgang von Kleinschmidt |
| Warren Oates | Colonel Madman Maddox |
| Bobby DiCicco | Wally Stephens |
| Dianne Kay | Betty Douglas |
| Murray Hamilton | Claude Crumm |
| Slim Pickens | Hollis P. Wood |
| Eddie Deezen | Herbie Kaziminsky |
| John Candy | Private Foley |
Southern Californians and military personnel panic under rumors of a Japanese attack in their own backyard.
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