Maklii was a male member of Tessic's species who worked at the deuterium mining camp the Enterprise NX-01 visited in 2152. The camp was being terrorized by a group of Klingon marauders who had been terrorizing the camp the previous five seasons and stole their deuterium. When Enterprise arrived, Tessic, the leader of the camp, 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 workers, visited Enterprise to practice the use of energy weapons. He and the rest of his camp were able to drive the Klingons off with the assistance of the crew of the Enterprise. (ENT: "Marauders")