Malcor III was the third planet in the Malcor planetary system. Located over 2,000 light years from Earth, this was the homeworld for the Malcorians, a humanoid species. The planet was led by a chancellor.
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")