George Vraca

professor Dan Olteanu

Irina Răchițeanu

Anca Olteanu, Dan's wife

Jules Cazaban

colonel Jack Paleologu

Fory Etterle

engineer Tasca

Ion Lucian

Virgil Sachelarie, professor Olteanu's assistant

Grigore Vasiliu-Birlic

Mișu

Mircea Constantinescu

professor Cristea

Graziela Albini

Sanda Costiniu

Ion Henter

foreign agent Spiridon Dumitrescu

Gheorghe Ionescu-Gion

Dinu Negreanu