Star Wars; Into The Black
The Enos were a pre-humanoid species that originated on the planet Gama.
Due to geographical conditions, they developed a culture that placed a high priority on cooperation and peaceful coexistence. Aggression was discouraged, but self-defense (with the aim of ending the conflict) was acceptable, both on an individual and societal scale. Splinter movements of a more violent temperament did arise at several points in their history, but were short-lived due to the willingness of the majority to defend themselves without embracing a philosophy of violence.
The Enos considered themselves a part of a network of life on their planet, and once they became culturally aware that theirs was not the only planet in the universe, they assumed that there was a similar, larger network throughout the universe, and expected to join it when they became a spacefaring race. They were dismayed when their attempts to make contact with other races received no response, and even more displeased when their explorations in their own and nearby systems revealed no life whatsoever on any world but their own.
The lack of company in the universe bothered the Enos on a very deep level, and over time, they developed a plan to “seed” other worlds with life, in order to populate the universe. Their cultural focus on cooperation helped to overcome the fact that no one who worked on the project would live to see the fruits of their labors; they knew that they were building the network of life that they felt was essential to the universe, and that made them a part of that network.
The seedship Leviathan was the culmination of that plan. The ship was equipped to travel a long, looping path through the universe, scanning for existing life or planets that seemed hospitable, and dropping probes to gather information or provide the building blocks for life, as appropriate. It would stay as close to the speed of light as their technology allowed at all times, allowing it to visit a vast number of systems before returning to the location Enos would be occupying several billion years later. The subjective time on board would be approximately one hundred and twenty years, total, which allowed for the original crew to return to see what had become of their home planet during their voyage.
After the Leviathan was sent out on its mission, the remaining Enos continued to develop technologies allowing them to directly colonize nearby systems. Over time, the distances involved, combined with the lack of FTL travel, caused their culture to develop many variants, and their descendants are in many cases barely discernible as related to one another. Their shared origins have been completely forgotten in almost every culture, although there is occasionally a surviving hint in obscure creation myths buried in the mists of the past.
While the majority of the crew of the Leviathan either chose to disembark in order to finish their lives on a planet or were killed in various mechanical accidents, one second-generation member did finish the mission. Chapman, son of Askr and Embla (captain and primary medical officer of the mission, respectively), brought the ship to the original galaxy and made contact with the current denizens in the form of the Dart’s current crew.
Physically, the Enos are remarkably like modern humans in appearance, even possessing the same numbers of fingers and toes. Their home world, Gama had significantly heavier gravity than is now considered “standard”, causing Enos to be short and somewhat squat compared to their modern counterparts. They are very long-lived compared to their descendants, with two hundred years being a common milestone, with exceptional individuals reaching up to four hundred.