Space Prison (original title

DOOMED! Crushing gravity-thin air-winters of unimaginable cold-searing summers under two suns-a deadly wasteland teeming with monsters and killing fever- That was Ragnarok, the most dreaded planet yet discovered. And Ragnarok was where a thousand untrained Earthmen-and women and children-were brutally marooned by a sadistic enemy. Two hundred died the first night. In the morning, the survivors knew what they must live for-revenge!