 | Kent Taylor | ... | Boston Blackie (58 episodes, 1951-1953) |
 | Lois Collier | ... | Mary Wesley (58 episodes, 1951-1953) |
 | Frank Orth | ... | Inspector Faraday (58 episodes, 1951-1953) |
 | Bill Catching | ... | Policeman / ... (17 episodes, 1951-1953) |
 | Troy Melton | ... | Officer Kelly / ... (11 episodes, 1951-1953) |
 | Louise Arthur | ... | Ella Mantelli / ... (3 episodes, 1951-1952) |
 | Karl 'Killer' Davis | ... | Killer / ... (3 episodes, 1951) |
 | John Kellogg | ... | Barry Morgan / ... (3 episodes, 1952-1953) |
 | Anne Kimbell | ... | Anne Morgan / ... (3 episodes, 1952-1953) |
 | John Carson | ... | Duke / ... (3 episodes, 1952) |
 | Marshall Reed | ... | Slick (3 episodes, 1951-1953) |
 | Skelton Knaggs | ... | Archie the Dip / ... (3 episodes, 1952) |
 | Emory Parnell | ... | Bishop / ... (3 episodes, 1952-1953) |

| Allen Jenkins | ... | Gregory Phillips (3 episodes, 1952-1953) |
 | Charles Wagenheim | | (3 episodes, 1952-1953) |
 | Mary Young | ... | Needles (3 episodes, 1952-1953) |
 | Earle Hodgins | ... | Knot Head (3 episodes, 1952) |
 | Reed Howes | | (3 episodes, 1952) |
 | Don Peters | | (3 episodes, 1952) |
 | Ben Welden | ... | Slugs (2 episodes, 1951-1953) |
 | Evelyn Eaton | ... | Lenore Aldwin / ... (2 episodes, 1951-1952) |
 | Bernadene Hayes | ... | Mrs. Trumbull (2 episodes, 1951) |
 | Margaret Hedin | ... | Sandra (2 episodes, 1951-1953) |
 | Richard Crane | ... | Tommy Adams (2 episodes, 1951) |
 | Terry Frost | ... | Ollie Ward (2 episodes, 1951) |
 | Tom Neal | | (2 episodes, 1951) |
 | Thayer Roberts | | (2 episodes, 1951) |
 | Michael Vallon | | (2 episodes, 1951) |
 | Michael Whalen | | (2 episodes, 1951) |
 | Clark Howat | ... | Hanlon / ... (2 episodes, 1952) |
 | Valerie Vernon | ... | Madeline Warren (2 episodes, 1952) |
 | Lorna Thayer | ... | Rachel Hendrix (2 episodes, 1951-1953) |
 | Paul Bryar | ... | Monk (2 episodes, 1951) |
 | Lester Dorr | | (2 episodes, 1951) |
 | John Eldredge | | (2 episodes, 1951) |
 | Frank Jenks | | (2 episodes, 1951) |
 | Frank Mitchell | ... | Fred Carson (2 episodes, 1951) |

| William Bakewell | ... | Lang (2 episodes, 1952) |
 | Stephen Chase | | (2 episodes, 1952) |
 | Wheaton Chambers | ... | C.A. Vincent (2 episodes, 1951-1953) |
 | Tom Kennedy | | (2 episodes, 1951) |
 | George Pembroke | ... | Carl Millman (2 episodes, 1951) |
 | John Indrisano | ... | Spoiler Garrett / ... (2 episodes, 1952-1953) |
 | Peter Mamakos | ... | Hayes / ... (2 episodes, 1952) |
 | Sam Scar | ... | Hank (2 episodes, 1951) |
 | John Sebastian | ... | Shiver (2 episodes, 1951) |
 | Paul Purcell | | (2 episodes, 1952) |
 | Tracey Roberts | ... | Louella / ... (2 episodes, 1952) |
 | Tom Tyler | | (2 episodes, 1951-1952) |

| Lee Van Cleef | ... | Captain Jansen / ... (2 episodes, 1952) |
 | Robert Stevenson | ... | Danny (2 episodes, 1951) |
 | Don Dillaway | | (2 episodes, 1952-1953) |
 | Donald Kerr | | (2 episodes, 1951-1952) |
 | Jack Mulhall | ... | Cafe Owmer (2 episodes, 1951) |
 | Christine Larsen | | (2 episodes, 1951-1953) |
 | John Merton | | (2 episodes, 1951-1953) |
 | George Douglas | | (2 episodes, 1951-1952) |
 | James Guilfoyle | | (2 episodes, 1951-1952) |
 | Norval Mitchell | | (2 episodes, 1951-1952) |
 | Robert Spencer | | (2 episodes, 1951-1952) |
 | Wendy Waldron | | (2 episodes, 1951-1952) |
 | Fred Sherman | | (2 episodes, 1951) |
 | Stephen Gregory | | (2 episodes, 1952) |
 | William Henry | | (2 episodes, 1952) |
 | Frank Marlowe | | (2 episodes, 1952) |
 | John Pickard | | (2 episodes, 1952) |
 | Hugh Prosser | | (2 episodes, 1952) |
 | Jack Roper | | (2 episodes, 1952) |

| Joe Turkel | ... | Pinky (2 episodes, 1952) |
 | Sheila Watson | | (2 episodes, 1952) |
 | Philip Van Zandt | | (2 episodes, 1953) |