The Sci-Fi Slaves: The Dracs, a reptilian species that reproduce asexually.
The Situation: Dracs and humans have been at war for decades - both civilizations have space-faring technology and thrive in the same atmospheres, so fierce battle is waged over inhabitable worlds. Humans have no use for Drac prisoners of war, though, and rogue groups of slavers frequently capture them and force them to work on mining planets where their reptile biology is advantageous. In Enemy Mine, an underrated cult classic from 1985, a human fighter pilot and his Drac counterpart are stranded on a distant planet together and learn to understand each other - until other humans show up and wreck the whole deal.
How Bad Do They Have It? Pretty bad. Mining is one of the worst jobs in the universe, and their status as enemy combatants means nobody cares about human rights abuses.
