Onder andere met: Tony Kendall (Jo Louis Walker / 'Kommissar X'), Brad Harris (Captain Tom Rowland), Corny Collins (Emily Lambert), Hannelore Auer (Betty Rogers), Siegfried Rauch (Anthony), Erika Blanc (Elizabeth Hillary), Franco Fantasia (Robert Hillary / Arthur Hillary), Erwin Strahl (Inspektor Lefèvre), Gianfranco Parolini (Smoky (as Frank Kramer)), Frank Valentin , Laci von Ronay (Inspektor Barry (as Laci v. Ronay)), Carlos de Castro (William Rogers), Werner Hauff (Inspektor Jackson), Jens Herold (Arzt)