Cast

• Innokenti Smoktunovsky as I.O.O.
• Vasili Merkuryev
  Vasili Merkuryev
  -Selected filmography:* The Return of Maxim * Professor Mamlock * The Vyborg Side * The Great Glinka * The Vow * The Battle of Stalingrad * True Friends * Twelfth Night...
  
   as academician Blagovidov
• Lev Durov
  Lev Durov
  Lev Konstantinovich Durov is a Soviet/Russian theatre and films actor since 1955, People's Artist of USSR.-Filmography:actor* I Step Through Moscow * All The King's Men - Sugar Boy* Stariki-razboyniki - driver...
  
   as academician Filatov
• Yuri Medvedev as academician Ogon-Duganovsky
• Pyotr Merkuryev as academician Kurochkin

Space ship Zarya crew

• Mikhail Yershov as Vitya Sereda
• Aleksandr Grigoryev as Pasha Kozelkov
• Vladimir Savin as Misha Kopanygin
• Vladimir Basov Jr. as Fedya "Lob" Lobanov
• Olga Bityukova as Varya Kuteishchikova
• Nadezhda Ovcharova as Yulia Sorokina
• Irina Popova as Katya Panfyorova

Other cast

• Vadim Ledogorov as Agapit
• Igor Ledogorov as Agapit's father
• Natalya Fateyeva
• Anatoli Adoskin
• Aleksandr Lenkov
• Nikolai Pogodin
  Nikolai Pogodin
  Nikolai Fyodorovich Pogodin was a Soviet playwright.Born into a peasant family at Gundorovskaya Stantsiya in the Don Province, young Nikolai Stukalov "spent a wandering childhood with his mother, who travelled from one Cossack village to another taking in sewing"; he worked as a bookbinder and...
  
  
• Raisa Ryazanova
• S. Safonov
• Nadezhda Semyontsova
• Vladimir Shiryayev
• Olga Soshnikova
• Aleksandr Vigdorov
• Mikhail Yanushkevich
• Aleksandr Zimin

Awards

• Premio for the Best Film for Kids and Youth of the All-Union Cinema Festival, Kishinev, 1975
• Special Premio "Silver Asteroid" of the International Cinema Festival of Science Fiction Films, Triest, 1976
• Gran Premio of the International Festival at Panama
  Panama
  Panama , officially the Republic of Panama , is the southernmost country of Central America. Situated on the isthmus connecting North and South America, it is bordered by Costa Rica to the northwest, Colombia to the southeast, the Caribbean Sea to the north and the Pacific Ocean to the south. The...
  
  , 1976
• State Premio of RSFSR in the honour of Vasilyiev Brothers, 1977.