| Series cast summary: |
 | Giorgio Albertazzi | - | Philo Vance 6 episodes, 1974 |
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 | Sergio Rossi | - | John Markham 6 episodes, 1974 |
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| Silvio Anselmo | - | Heath 6 episodes, 1974 |
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| Varo Soleri | - | Currie 6 episodes, 1974 |
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| Gino Nelinti | - | Agente Snitkin 4 episodes, 1974 |
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| Mauro Avogadro | - | Rex Greene 2 episodes, 1974 |
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| Nais Lago | - | Signorina Hemming 2 episodes, 1974 |
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| Gianfranco Barra | - | Dottor Doremus 2 episodes, 1974 |
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 | Virna Lisi | - | Margaret Odell 2 episodes, 1974 |
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| Mico Cundari | - | Chester Greene 2 episodes, 1974 |
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| Giorgio Piazza | - | Kenneth Spotswoode 2 episodes, 1974 |
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| Elena Zareschi | - | Signora Greene 2 episodes, 1974 |
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| Anna Maria Gherardi | - | Sibilla Greene 2 episodes, 1974 |
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| Giovanni Guerrieri | - | Jessup 2 episodes, 1974 |
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| Giorgio Bonora | - | Leandro Pfyfe 2 episodes, 1974 |
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| Andrea Lala | - | Dottor Von Bloon 2 episodes, 1974 |
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| Quinto Parmeggiani | - | Maggiore Benson 2 episodes, 1974 |
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 | Paola Quattrini | - | Muriel Clair 2 episodes, 1974 |
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| Micaela Esdra | - | Ada Greene 2 episodes, 1974 |
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| Silvana Panfili | - | Julie Gray 2 episodes, 1974 |
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| Enza Giovine | - | Signora Platz 2 episodes, 1974 |
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| Gilberto Mazzi | - | Colonnello Ostrander 2 episodes, 1974 |
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 | Giacomo Rossi Stuart | - | Pop Cleaver 2 episodes, 1974 |
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| Vittorio Congia | - | Louis Mannix 2 episodes, 1974 |
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| Antonio Meschini | - | Dottor Lindquist 2 episodes, 1974 |
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 | Luciano Virgilio | - | Capitano Leacock 2 episodes, 1974 |
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| Anna Zamboni | - | Miss Frisby 2 episodes, 1974 |
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| Lia Tanzi | - | Giorgina La Fosse 2 episodes, 1974 |
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