Testuoid

Testuoids are a reptilian race, with small, round bodies and rubbery limbs. They do not possess a rigid skeletal structure like other beings. Their "skeleton" is composed of a gel-like material which can be hardened or softened at will. They are thus a very flexible, if not physically strong race.

Trandohsanite

Natives of the planet Trandoh. A mature adult grows between 4-6 feet tall. Trandohsanites do not posses a hard skeletal structure. Instead their rubber bodies are supported by an intricate network of interlocking tubules, which give them the ability to stretch their bodies in unnatural positions. They can thus squeeze through very small cracks or compact their bodies into tiny areas. Trandohsanites do not possess eyelids, and must keep their eyes constantly moist. For this reason when encountered off planet they will usually be seen wearing some sort of eye protection.

Gzlob

Gzlobs are a hardy race. Their skin is tough and rubbery, and can resist high velocity shell impacts or electrical discharges. They come from a very large, dense world, and as such have what appears to be abnormal strength for their size. They do not breathe planetary atmospheres, and have no adverse reactions to extreme heat, cold, or pressure. They are thus able to survive in any number of hostile environments, including at the bottom of oceans or in the vaccum of space (for limited periods of time.)