Horst Tappert as Stephan Derrick (voice)

Fritz Wepper as Harry Klein (voice)

Gustav Peter Wöhler as Arno Hello (voice)

Wolfgang Stumph as Dr. Zark (voice)

Anke Kortemeier as Tina (voice)

Mechthild Großmann as Mrs. Schmutz (voice)

Ralph Morgenstern as Linda (voice)

Nathalie Licard as Secret Weapon (voice)

Claudia Lössl as Elfriede Mitzenheim (voice)

Stefan Gossler as Falk (voice)

Jörg Stuttmann as Frank (voice)

Ruth Rockenschaub as Mother (voice)

Doris Gallart as Sister Domina (voice)

Marina Köhler as Dr. Ingeborg (voice)

Gerhard Georg Jilka as Policeman (voice)

Jürgen Drews as Arno Hello in Contest (voice)