The Sok'an were a symbiotic civilization from the planet Sok'drwr, a homeworld located somewhere in the galaxy's Alpha or Beta Quadrants. They closely resembled ordinary sock puppets, especially when joined with a human host. Mr. Sock was a Sok'an, who had joined with Starfleet Captain Clinch and became a crewmember aboard the Federation starship USS Armitage. (ST comic: "A Sock Time")