Scalos
Scalos was a formerly inhabited planet located in the Scalos system. This was the homeworld of the Scalosians, an extinct humanoid species. This planet was located in an outer quadrant of the galaxy, in the Alpha Quadrant. 

By 2259, the Federation had established first contact with this planet. This civilization had developed warp travel and had or was in the process of being inducted into the Federation by this year. ()

When the  was exploring this quadrant, the starship picked up a distress call coming from a city on this planet. A landing party discovered that the world was barren. There were no apparent animal lifeforms and sparse vegetation. According to the distress call, there were 900,000 Scalosians who lived in a nation; 113,000 of them in one city. Their civilization was rated 7 on the industrial scale. 

After the world was devastated by volcanic eruptions that contaminated the water with radiation, the Scalosians changed. They were hyper-accelerated. The children died, with many females being unable of carrying children and the males were . Desperate, the Scalosians looked for mates outside their world. When a spaceship passed by, a distress call was sent and, when the ship came in to investigate, the crew were captured. After being hyper-accelerated, they did not last long, so the Scalosians waited for the next ship as their population plummeted. 

When the planet was visited by the Starfleet vessel  in 2268, only five hyper-accelerated individuals remained. After the Enterprise visited the planet, the Federation quarantined the planet. ()

In 2399, the location of Scalos was labeled on a Federation star chart that was in Fleet Admiral Kirsten Clancy's office at Starfleet Headquarters. This planet was in neutral space. ()

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