| Actor | Role |
|---|---|
 Rostislav YankovskyProfessor Viktor Flyagin | Professor Viktor Flyagin |
 Aleksandr KaydanovskiyValentin Orlov | Valentin Orlov |
 Leonid YarmolnikPasha Rubakin | Pasha Rubakin |
 Andrei PopovProfessor Nikolay Zavalishin | Professor Nikolay Zavalishin |
 Svetlana KuzminaNina Astashova | Nina Astashova |
 Yelena AntonenkoLyuda Velichko | Lyuda Velichko |
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