| Anthony George | ... | Don Corey | |
| Doug McClure | ... | Jed Sills | |
| Sebastian Cabot | ... | Dr. Carl Hyatt | |
| Lloyd Bridges | ... | Howard Gentry / Robert Gentry | |
| Audrey Dalton | ... | Ann Miles | |
| Paul Langton | ... | The Architect | |
| Barney Phillips | ... | Capt. Jack Howard | |
| Sheila Bromley | ... | Mrs. Welch | |
| Stephanie Hill | ... | The Girl | |
| Jeane Wood | ... | The Librarian | |
| rest of cast listed alphabetically: | |||
| Sam Hearn | ... | Proprietor (uncredited) | |
| Episode Crew |
Directed by | |||
| Paul Stewart | |||
Writing credits(in alphabetical order) | ||
| Eric Ambler | creator | |
| Lewis Reed | teleplay | |
Produced by | |||
| Richard Berg | .... | producer (as Dick Berg) | |
| Jon Kubichan | .... | associate producer | |
Original Music by | |||
| John Williams | (as Johnny Williams) | ||
Cinematography by | |||
| Benjamin H. Kline | (director of photography) | ||
Film Editing by | |||
| Howard Epstein | |||
Art Direction by | |||
| John J. Lloyd | |||
Set Decoration by | |||
| Robert C. Bradfield | |||
| John McCarthy Jr. | (as John McCarthy) | ||
Makeup Department | |||
| Jack Barron | .... | makeup artist | |
| Florence Bush | .... | hair stylist | |
Second Unit Director or Assistant Director | |||
| Edward K. Dodds | .... | assistant director | |
Sound Department | |||
| Frank H. Wilkinson | .... | sound | |
Costume and Wardrobe Department | |||
| Vincent Dee | .... | costume supervisor | |
Editorial Department | |||
| David J. O'Connell | .... | editorial department head | |
Music Department | |||
| Stanley Wilson | .... | music supervisor | |
| John Williams | .... | composer: theme music (uncredited) | |
Other crew | |||
| Dorothy Hechtlinger | .... | story editor | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Crime section |