The Enkarans were a tribe of humanoid aliens that SG-1 helped return to their ancestors' home world after they were freed from slavery under the Goa'uld. The original Enkaran home world had no Stargate. It was believed that the Goa'uld took a group of Enkarans from their world in spaceships long ago.The Enkarans were humanoid, but their unique physiology made them extremely sensitive to specific atmospheric conditions. Without the exact environmental conditions the Enkarans went blind and eventually died. Their physiology was adapted to an extremely rare atmosphere which allowed them to thrive.