Malcor III was the inhabited third planet in the Malcor system. Located over 2,000 light years from Earth, this was the homeworld for the Malcorians, a humanoid species. The planet was headed by a chancellor.
The Malcorians divided the planet's day into 29 hours.
In 2367, the planet made First Contact with the Federation prematurely when William T. Riker, on a mission to investigate the species, was revealed as an alien. Avel Durken was the planet's chancellor at this time. (TNG: "First Contact")