Mirt was an Iotian gangster who worked for Bela Okmyx's gang in the Northside Territory.

In 2268, he was part of the gangsters who met James T. Kirk and Spock when they beamed down to Sigma Iotia II. He gave the three officers a shake down, taking their phasers and communicators before covering them, along with Kalo, to Okmyx's headquarters. En route, he was killed in a "hit" made by Zabo and two hoods employed by Jojo Krako. (TOS: "A Piece of the Action")

Mirt was played by Jay Jones. His name comes from the final draft of the episode's script, dated 25 October 1967, which describes him as "tough-looking, sharply-dressed."
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