Unknown Opponent (Hungarian: Ismeretlen ellenfél) is a 1940 Hungarian spy thriller film directed by Endre Rodríguez and starring Erzsi Simor, Andor Ajtay and Karola Zala.^{[1] [2]} It was shot at the Hunnia Studios in Budapest. The film's sets were designed by the art director Miklós Velits.

A foreign power interested in a new Hungarian prototype aircraft recruit Adrienne to steal the plans, but she falls for László the engineer behind the new design.

• Erzsi Simor as Adrienne
• Andor Ajtay as Marton László
• Karola Zala as Id. Martonné
• László Földényi as Bratt, kémfõnök
• Nusi Somogyi as Bözsi
• Zoltán Greguss as A 127-es kém
• Éva Adorján as Titkárnõ
• Béla Mihályffi as A kémelhárítás vezetõje
• Sári Barabás as énekesnõ
• Lajos Kelemen as Bendzsós
• Ferenc Pethes as Munkavezetõ
• Tihamér Lázár as Rendõrfõnök
• Anni Eisen as Méltóságos asszony a bárban
• Dóra Fáy Kiss as Bárhölgy
• Béla Fáy as Alezredes
• Ottó Jeney as Kovács, Bratt sofõrje
• Árpád Latabár as Tóbiás - üzletvezetõ
• Zoltán Pethö as Kémfõnök
• Sándor Tompa as Rendõr

• Juhász, István. Kincses magyar filmtár 1931–1944: az eredeti forgatókönyvből 1931 és 1944 között létrejött hazai mozgóképekről. Kráter, 2007.
• Rîpeanu, Bujor. (ed.) International Directory of Cinematographers, Set- and Costume Designers in Film: Hungary (from the beginnings to 1988). Saur, 1981.

• Unknown Opponent at IMDb

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