砂漠の惑星
"The Invincible" originally appeared as the title story in Lem's collection "Niezwyciężony i inne opowiadania" (""The Invincible" and Other Stories"). A translation into German was published in 1967; an English translation by Wendayne Ackerman, based on the German one, was published in 1973. A direct translation into English from Polish, by Bill Johnston, was published in 2006.