Krios or Krios Prime was a Klingon colony near the Federation-Klingon border. In 2367, the Federation was accused by the planet's governor, Vagh, of aiding the planet's rebels who hoped to free the planet from Klingon rule. However it was revealed that the Romulans were secretly aiding the rebels helped by a Klingon ambassador, Kell. (TNG: The Mind's Eye)
- It is not clear, whether this is the same planet named "Krios" from TNG: "The Perfect Mate", which seems to have more similarities with "Krios Prime" mentioned in ENT: "Precious Cargo".