For the planet sharing this name, please see Krios Prime.

Krios and his brother Valt were the rulers of a vast Kriosian empire, which they ruled from the ancient Temple of Akadar. Krios Prime was named after him.

The two became divided over the love of a woman, an empathic metamorph named Garuth. They both loved Garuth with such passion that the Kriosian empire fell. Krios eventually kidnapped Garuth from their homeworld and took her to the planet that became his namesake. This action started a war between the two worlds that lasted several centuries. (TNG: "The Perfect Mate")

This character was only mentioned in dialogue.
In the third draft script of "The Perfect Mate", the war had only lasted decades rather than centuries.
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