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Krax was the son of Grand Nagus Zek and the unofficial heir apparent to the throne of the Ferengi Alliance. Krax was shocked when Zek unexpectedly nominated Quark to be his successor in 2369, and immediately retired. When Zek died shortly thereafter, Krax plotted with Quark's brother Rom to assassinate the new Nagus.

Fortunately for Quark, Zek reappeared a short time later, revealing that the entire incident had been a ruse to test Krax's eligibility for becoming the new Nagus. Krax failed the test miserably; as Zek said, "You don't grab power... you accumulate it, quietly." (DS9: "The Nagus")

Krax was played by actor Lou Wagner.
Although his father Zek became a recurring character on the series, Krax was never mentioned in any subsequent episode of Deep Space Nine, suggesting that he fell permanently into disfavor.
Krax also appeared in the Deep Space Nine novels The Big Game and Ferenginar: Satisfaction is not Guaranteed, as well as in the eBook novella Rules of Accusation. Krax becomes Rom's First Clerk.

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