Maklii was a male member of an alien species who worked at a deuterium mining colony in the 2150s.

Enterprise NX-01 visited this colony in 2152 and witnessed a group of Klingon marauders who had been terrorizing the colony the previous five seasons and stole their deuterium. When Enterprise arrived, Tessic, the leader of the colony, wished to have nothing to do with them, but Maklii helped broker a deal with the crew, exchanging deuterium for medical supplies, power cells, and assistance in repairing the colony's extraction pumps.

When the Klingons arrived and the deuterium was not ready, they beat Maklii and threatened to kill him after they felt that he did not give them the proper respect. He was among those who agreed to fight off the Klingons. He, along with a few of the other colonists, visited Enterprise to practice the use of energy weapons. Maklii and the rest of his colony were able to drive the Klingons off with the assistance of the crew of Enterprise. (ENT: "Marauders")

Maklii was played by actor Steven Flynn. His name comes from the script.
In the final draft script of "Marauders", Maklii was initially described thus; "Maklii is the drill foreman. He's not as reserved as Tessic and he's more likely to speak his mind, or let his temper flare."
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