| Arthur Conan Doyle |
– Author |
| Sven Lange (Norge) |
– Dramatised by (for radio) |
| Paul Skoe |
– Direction |
| Eyvind Solås |
– Music |
| Roy Bjørnstad |
– Actor (Austin, tjener / Zambo) |
| Dan Fosse |
– Actor (Lopez) |
| Torbjørn Halvorsen |
– Actor (En drosjesjåfør / 3. reporter) |
| Sverre Hansen |
– Actor (Professor Summerlee) |
| Knut M. Hansson |
– Actor (McArdle, nyhetsredaktør / 1. møtedeltager) |
| Per Theodor Haugen |
– Actor (Edward (Ned) Malone, journalist) |
| Bjørn Jenseg |
– Actor (Tarp Henry, journalist / 1. reporter) |
| Randi Koch |
– Actor (Gladys) |
| Birger Løvaas |
– Actor (Jenkins, kelner / 2. møtedeltager) |
| Ole-Jørgen Nilsen |
– Actor (Dr. James Hungerton / En konstabel) |
| Thorleif Reiss |
– Actor (Mr. Percival Waldron / Hertugen av Durham) |
| Nancy Scheflo |
– Actor (Stuepiken) |
| Merete Skavlan |
– Actor (Mrs. Challenger) |
| Tor Stokke |
– Actor (Lord John Roxton) |
| Per Sunderland |
– Actor (Professor Challenger) |
| Sverre Wilberg |
– Actor (Presidenten i Zoologisk Institutt / 2. reporter) |
| Carsten Winger |
– Actor (Dr. James Illingworth) |
| Jan Pande-Rolfsen |
– Other (Annonsering) |
| Jan Erik Hoel |
– Technical direction |
