Players were expected to be "space cops" fighting the aggressive incursions of the alien race known as the Sathar.
The Yazirian race, available to player characters, strongly resembled Winged Monkeys of Oz, and the fictional species was rehashed as Shadow People in TSR's later Dragonlance series of campaign modules. Both species also bear a strong resemblance to the High Martians of GDW's Space:1889 RPG.