| Episode cast overview, first billed only: |
 | Emilio Gutiérrez Caba | - | Freddy Malone (as Emilio G. Caba) |
 | Queta Claver | - | Sra. Hewlett |
| Alfonso Zambrano | - | D'Arcy Tuck |
| Maria Jesús Lleonart | - | Prudencia (as Mª Jesus Lleonart) |
| Joaquim Cardona | - | Osvaldo Veal |
| Ana María Mauri | - | Joan Hewlett (as Ana Mª Mauri) |
| Josep Peñalver | - | Simon Veal (as Jose Peñalver) |
| Gabriel Agustí | - | Inspector Sibley (as Gabriel Agusti) |
| Luis Posada | | |
| Fernando Ulloa | - | Marchand |
| Josefina Güell | - | Lady Chudleigh |
| Josep Castillo Escalona | - | (as J. Castillo Escalona) |
| Maribel Álvarez | - | Ruth Bennett (as Maribel Alvarez) |
| José Luis Romero | - | Sir George Chudleigh (as Jose Luis Romero) |
| Eugenia Roca | - | Sra. Orlock |
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