 | Ronald Howard | ... | Sherlock Holmes (39 episodes, 1954-1955) |
 | Howard Marion-Crawford | ... | Dr. John H. Watson (39 episodes, 1954-1955) |
 | Archie Duncan | ... | Inspector Lestrade / ... (32 episodes, 1954-1955) |
 | Richard Larke | ... | Sgt. Wilkins / ... (16 episodes, 1954-1955) |
 | Eugene Deckers | ... | Harry Crocker / ... (7 episodes, 1954-1955) |
 | Colin Drake | ... | Albert Snow / ... (6 episodes, 1954-1955) |
 | Roland Bartrop | ... | Carpenter B / ... (6 episodes, 1954-1955) |
 | Richard Watson | ... | Campaign manager / ... (5 episodes, 1955) |
 | Eric Micklewood | ... | Coxin / ... (4 episodes, 1955) |
 | Duncan Elliott | ... | J. Oliver / ... (4 episodes, 1954-1955) |
 | June Peterson | ... | Mrs. Chivvy / ... (4 episodes, 1955) |
 | Alvys Maben | ... | Elizabeth Farnsworth / ... (3 episodes, 1955) |
 | June Shelley | ... | Jennifer Ames / ... (3 episodes, 1955) |
 | Maurice Teynac | ... | Comte de Passevant / ... (3 episodes, 1954-1955) |
 | Yves Brainville | ... | Lorenz / ... (3 episodes, 1954-1955) |
 | Zack Matalon | ... | Archibald Ross / ... (3 episodes, 1955) |
 | Pierre Gay | ... | Bricker / ... (3 episodes, 1954-1955) |
 | Margaret Russell | ... | Barmaid / ... (3 episodes, 1954-1955) |
 | Charles Brodie | ... | Harry Harkins / ... (3 episodes, 1954-1955) |
 | Sacha Pitoëff | ... | Constable Smith / ... (3 episodes, 1955) |
 | Russ Caprio | ... | Counter-protestor / ... (3 episodes, 1955) |
 | Bob Cunningham | ... | Bison Jack / ... (3 episodes, 1954-1955) |
 | Billy Beck | ... | Coco / ... (3 episodes, 1954-1955) |
 | Harry Towb | ... | Brian O'Casey / ... (2 episodes, 1954-1955) |
 | Martine Alexis | ... | Nana de Melimar / ... (2 episodes, 1954-1955) |

| Peter Copley | ... | John Winthrop / ... (2 episodes, 1954) |
 | Meg Lemonnier | ... | Alice Winthrop / ... (2 episodes, 1954) |
 | Basil Dignam | ... | Harringway / ... (2 episodes, 1955) |
 | Jacques François | ... | Count Magor / ... (2 episodes, 1955) |

| Delphine Seyrig | ... | Betty Durham / ... (2 episodes, 1954-1955) |
 | Lou Van Burg | ... | Claude Dubec / ... (2 episodes, 1954-1955) |
 | Cecil Brock | ... | Bobby / ... (2 episodes, 1954-1955) |
 | Frédéric O'Brady | ... | Bayard / ... (2 episodes, 1955) |
 | John Buckmaster | ... | Bartender / ... (2 episodes, 1955) |
 | Judith Haviland | ... | Helene / ... (2 episodes, 1955) |
 | Mary Sinclair | ... | Mrs. Janet Partridge / ... (2 episodes, 1955) |
 | Frank Dexter | ... | Courtroom constable / ... (2 episodes, 1954-1955) |
 | Lucille Vines | ... | Baxter's Secretary / ... (2 episodes, 1954-1955) |
 | Alan Adair | ... | George Farnsworth / ... (2 episodes, 1955) |
 | David Oxley | ... | Sailor / ... (2 episodes, 1955) |
 | Tony Wright | ... | John Cartwright / ... (2 episodes, 1955) |
 | Roger Emerson Garris | ... | Mr. Brundy - bouncer / ... (2 episodes, 1955) |
 | Seymour Green | ... | Commissioner / ... (2 episodes, 1955) |
 | Héléna Manson | ... | Agatha Axton / ... (2 episodes, 1955) |