Kaz was a senior officer aboard the IKS Klothos serving under Commander Kor during the 2260s. (TAS: "The Time Trap")

As a product of 22nd century genetic engineering, Kaz was descended from Klingons affected with the augment virus created in 2154. (ENT: "Divergence")

In 2269, Kaz was in charge of organizing the details for destroying the USS Enterprise following the combined escape of their two vessels from the Delta Triangle. While being entertained in the Enterprise's recreation room, he attempted to shoot Leonard McCoy for dancing with "his woman", an action which subsequently resulted in a hearing before the Elysian Ruling Council to determine whether the Klothos should be frozen for a star century as punishment for his actions. (TAS: "The Time Trap")

The voice of Kaz was provided by James Doohan.
The final draft of the script describes Kaz as Kor's "senior officer", furthermore, a deleted line from the same final draft reveals that Kaz was the ship's "science officer". The Star Trek Concordance goes so far as to say he is the ship's "second-in-command".
His name was spelled "Kaas" in the novelization appearing in Star Trek Log 4.
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