The Invincible
The Invincible (Polish: Niezwyciężony) is a hard science fiction novel by Polish writer Stanisław Lem, serialized in Gazeta Białostocka in 1963 and published as a book in 1964. The Invincible originally appeared as the title story in Lem's collection Niezwyciężony i inne opowiadania ("The Invincible and Other Stories").