The Vissians were highly advanced in the 2150s. They come from the Vissia system.
The Vissians had three genders: the third gender, the cogenitors, made up only 3% of the population and were treated as inferior, existing only for facilitating reproduction between males and females.
The Vissians claimed to have developed warp drive more than a millennium before Earth. In the 2150s, vissian spacetravel utilized superior warpcore and sensory technology compared with humans.