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Players were expected to be "space cops" from the United Planetary Federation (UPF) fighting aggressive incursions of the alien worm-like race known as the Sathar.
The Yazirian race 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.
The Dralasite race were short, gray blob-like creatures capable of changing their form to a limited extent by extending and retracting pseudopod limbs. Lacking a digestive system, they consumed their food in a fashion similar to that of an amoeba, surrounding and absorbing it. A network of nerves and veins intersected at a Dralasite's two eye spots.
The Vrusk were an insect-like race with eight walking legs and two five-clawed manipulating arms. Their ant-like heads included two antennae and two mandibles .