Krios Prime, or Krios, was the inhabited prime planet in the Kriosian system, in the Beta Quadrant. This system was near Starbase 117 and was the homeworld of the Kriosians. This planet was located on the border of Federation space in the region between Sectors 21166 and 22079.

This planet was named after Krios, who ruled the ancient Kriosian Empire with his brother Valt. The brothers became divided over the love for a woman named Garuth so eventually their empire fell. Krios kidnapped Garuth from her homeworld Valt Minor and took her to Krios Prime, which started a centuries-long war between the two worlds. (TNG: "The Perfect Mate")

By the 22nd century, the Kriosians were under the rule of the ‎Sovereign Dynasty of Krios Prime, a family known on hundreds of worlds. The royal guardsmen of the Dynasty were known as the Sovereign Guard. Their leader was known as the First Monarch, a post which Kaitaama ascended to in 2153. (ENT: "Precious Cargo")

By the mid-24th century, after conquering Krios and suspending Kriosian sovereignty, the Klingons established a colony on this planet. 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 Klingon Ambassador Kell, in an attempt to split the Klingon-Federation alliance, was in league with the Romulans, who were secretly aiding the rebels with forged Starfleet weapons. (TNG: "The Mind's Eye")

In 2368, Krios and Valt Minor took their first steps towards ending an ongoing war as Kamala, the first female metamorph born on Krios since the mid-23rd century was delivered for marriage to Chancellor Alrik of Valt Minor. (TNG: "The Perfect Mate")

Krios Prime 2368

Krios Prime in 2368

Background informationEdit

There is debate about whether the planet seen in TNG: "The Perfect Mate" and referenced in ENT: "Precious Cargo" was the same planet seen in TNG: "The Mind's Eye". There was no definitive statement in any episode to clarify their status. The name used in TNG: "The Mind's Eye" was the same as in TNG: "The Perfect Mate", but no other similarities exist. The planet's color changed between episodes, which could indicate an unintentional production mistake or an intentional differentiation between two different planets (see images). stated explicitly that there were two different planets and/or systems that shared the same name Krios. [1] In contrast, the Star Trek Encyclopedia (4th ed., vol. 1, p. 445) only listed a single entry for Krios. The planet was classified as a class M planet, which – by the 24th century – was located in Klingon space. The Kriosian system (Encyclopedia (vol. 1, p. 445)) was named as a protectorate of the Klingon Empire.

In ENT: "Precious Cargo", the matter was further complicated in a conversation between Trip Tucker and Kaitaama. As they part ways, it was made clear that there was more than one planet with the name Krios. Tucker asks to visit (simply) Krios, causing Kaitaama to correct him by saying "Krios Prime." The inclusion of this trivia by the writers was unnecessary for advancing the plot, but was very useful in discerning that there was more than one planet with this name. The Star Trek Encyclopedia (4th ed., vol. 1, p. 445), in its entry for "Krios Prime", directs the reader to "Krios", indicating the authors treat "Krios Prime" and "Krios" as interchangeable.

Krios, the primary of the Kriosian system, was located in the Beta Quadrant on a star chart seen in the Star Trek: Discovery episode "Magic to Make the Sanest Man Go Mad".

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