Jarvin was a Maquis fighter who served on the raider Val Jean under Chakotay until 2371. In that year, the Val Jean and the USS Voyager were both stranded in the Delta Quadrant by the Caretaker's array, and the Val Jean was destroyed when Chakotay rammed it into a Kazon warship while fighting the Kazon-Ogla. As a result, the crew of the Val Jean, Jarvin included, joined the crew of the Voyager as Starfleet personnel and traveled aboard Voyager during its historic trek home through the Delta Quadrant. (VOY: "Caretaker")

Later that year Jarvin heard of an altercation between B'Elanna Torres and Joe Carey (both engineers) and grew concerned of the future of the Maquis personnel aboard the ship. He said that he would support Chakotay if he ever planned to take over Voyager. Chakotay was not impressed, and threatened to throw Jarvin in the brig for mutiny should he ever speak that way again. (VOY: "Parallax")

Chakotay felt that Jarvin was one of the crew members likely to leave the ship to stay on the 37s' planet in a conversation between Chakotay and Janeway. Ultimately, however, all crewmembers opted to say aboard. (VOY: "The 37's")

Jarvin was played by Justin Williams.
The Star Trek Customizable Card Game gives his name as Marquay.
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