| Natalya Bondarchuk | Hari |
| Donatas Banionis | Kris Kelvin |
| Jüri Järvet | Dr. Snaut |
| Vladislav Dvorzhetsky | Henri Berton |
| Nikolai Grinko | Kelvin's Father |
| Anatoli Solonitsyn | Dr. Sartorius |
| Sos Sargsyan | Dr. Gibarian |
| Olga Barnet | Kelvin's Mother |
| Tamara Ogorodnikova | Aunt Anna |
| Georgi Tejkh | Prof. Messenger |
| Director | Andrei Tarkovsky |
| Producer | Viacheslav Tarasov |
| Writer | Stanislaw Lem; Fridrikh Gorenshtein |
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