| Hugh Beaumont | ... | Dennis O'Brien | |
| Ann Savage | ... | Ann Harmon | |
| Edward Brophy | ... | Prof. Shicker | |
| Richard Travis | ... | Police Inspector Lt. Bruger | |
| Margia Dean | ... | Flo Klingle | |
| Mike Mazurki | ... | Ape Danowski | |
| David Bruce | ... | Charles Giffen | |
| Raymond Greenleaf | ... | Father Donovan | |
| Eve Miller | ... | Norma Harmon | |
| Harry Hayden | ... | Dr. Earl J. Tomkins | |
| Joi Lansing | ... | The Cocktail Waitress (as Joy Lansing) | |
| Peter Mamakos | ... | Nick Garrison | |
| Chris Drake | ... | Mike Greeley - aka Joe Harmon | |
| John Indrisano | ... | Mushy Cavelli (as Johnny Indrasano) | |
| Bill Varga | ... | Willie Klingle | |
| Richard Monahan | ... | Henry - Bartender | |
| Charles Wagenheim | ... | Lefty - Policy Man | |
| rest of cast listed alphabetically: | |||
| Heinie Conklin | ... | Counter Man (uncredited) | |
| Kit Guard | ... | Drunk at Wrestling Match (uncredited) | |
Directed by | |||
| William Berke | |||
Writing credits | ||
| Herbert H. Margolis | (story) (as Herbert Margolis) and | |
| Lou Morheim | (story) (as Louis Morheim) | |
| Julian Harmon | (screenplay) and | |
| Victor West | (screenplay) | |
Produced by | |||
| William Berke | .... | producer | |
| Jack Leewood | .... | associate producer | |
Original Music by | |||
| Bert Shefter | |||
Cinematography by | |||
| Jack Greenhalgh | |||
Film Editing by | |||
| Carl Pierson | |||
| Harry Reynolds | |||
Art Direction by | |||
| Frank Paul Sylos | (as F. Paul Sylos) | ||
Set Decoration by | |||
| Harry Reif | |||
Makeup Department | |||
| Paul Stanhope | .... | makeup artist | |
Second Unit Director or Assistant Director | |||
| John Francis Murphy | .... | assistant director (as J. Francis Murphy) | |
Art Department | |||
| Leigh Carson | .... | property master | |
| Tom Kemp | .... | construction supervisor | |
Sound Department | |||
| Glen Glenn | .... | sound | |
Special Effects by | |||
| Ray Mercer | .... | special effects | |
Costume and Wardrobe Department | |||
| Alfred Berke | .... | wardrobe (as Al Berke) | |
Other crew | |||
| Diane | .... | handknits and fashions | |
| Stanley Price | .... | dialogue coach | |
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| Danger Zone | The Spider Returns | The Drag-Net | Indestructible Man | The Galloping Ghost |
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| Full cast and crew | Company credits | External reviews |
| IMDb Comedy section | IMDb USA section |
In the early days of television (circa late-40s to early 50s)the makers of many of the cheapjack, poverty-row syndicated series---Guy Madison's Wild Bill Hickock, Reed Hadley's Racket Squad, others) would take two or three of the 30-minute television episodes, stitch them together and peddle them to the small-town and/or b-feature theatre-exhibitors as a "NEW" feature-length film. The film-exhibitors knew better, but most of these films were booked into towns and areas of the country where television coverage was, at best, spotty and often non-existent. Basically, a large percentage of the audience that saw these "films" in a theatre didn't own a television set or live in an area that had a television station. Plus, there was the large-and-profitable overseas market to be tapped.
Exhibitor-producer-distributor-showman Robert L. Lippert took this concept in another direction; his plan was to make three feature films, each of which had two separate 30-minute plots with continuing characters, book them into theatres and, after, they had exhausted the B-feature theatrical-circuit, cut them in half and sell the six 30-minute segments to television. Either as a series or a stand-alone 30-minute gap-filler.
Thusly was born "Pier 23", "Roaring City" and "Danger Zone." Three films in six segments featuring a San Francisco, hard-boiled private-eye named Dennis O'Brien. Made for theatres with intent-to-sell-to television. William Berke---has anyone actually ever seen a billing credit for him as William A. Berke...don't bother, the answer is no---directed and produced all three films with screen plays credited to Julian Harmon and Victor West on all. And each carried a "based on a story by Herbert H. Margolis and Louis Morheim" credit. And where did these "based-ons" come from? Well, each and everyone of them had been "heard" before when they were used on a syndicated radio-series called "Pat Novak, For Hire." Mr. Novak was a hard-case, San Francisco private-eye who averaged getting knocked-out twice in every 30-minute radio episode. Dennis O'Brien maintains that average when he gets his about four times in each of these three films.