Assen Milanov
— Major Terziev
Nikola Galabov
— Leytenant Kirov
Andrey Chaprazov
— Engineer Ablamov
Валентина Борисова
— Yuliya Beleva
Lyubomir Dimitrov
— Lechev
Yordan Matev
— Prodanov
Ivan Hadzhirachev
— Direktor
Sonya Vasileva
— The laboratory assistant
Georgi Popov
— Operator
Leo Conforti
— Bay Stoyan
Mariya Stefanova
— Lyubka
Nadezhda Vakavchieva
