Natalya Bondarchuk as Hari

Donatas Banionis as Kris Kelvin

Jüri Järvet as Dr. Snaut

Vladislav Dvorzhetsky as Henri Berton

Nikolay Grinko as Kelvin's Father

Anatoliy Solonitsyn as Dr. Sartorius

Olga Barnet as Kelvin's Mother

Vitalik Kerdimun as Henri Berton's Son

Olga Kizilova as Guest of Dr. Gibarian

Tatyana Malykh as Kris Kelvin's Niece

Aleksandr Misharin as Shanahan, Chairman of the Anri Berton Commission

Bagrat Oganesyan as Professor Tarkhe

Tamara Ogorodnikova as Anna

Sos Sargsyan as Dr. Gibarian

Yulian Semyonov as Chairman of the Scientific Conference

Vitaliy Statsinskiy as Member of the Academic Council

Vera Sumenova as

Georgiy Teykh as Prof. Messenger