Set in the Soviet scientific community, Nine Days of One Year follows two dedicated physicists whose close friendship unfolds amid dangerous nuclear research, shaped by their shared affection for a strong-willed woman. As radiation exposure, scientific ambition, and personal relationships intersect, the film offers a thoughtful, human portrait of scientists confronting the risks of progress and the choices that define their lives.

Aleksey Batalov
as Dmitri Gusev

Innokentiy Smoktunovskiy
as Ilya Kulikov

Tatyana Lavrova
as Lyolya

Mikhail Kozakov
as Valery Ivanovich

Nikolai Plotnikov
as Professor Sintsov

Sergei Blinnikov
as Butov

Evgeniy Evstigneev
as Nikolai Ivanovich

Valentin Nikulin
as young physicist

Pavel Shpringfeld
as physicist

Lyusyena Ovchinnikova
as Nura, Gusev's younger sister