Multiple realities(covers information from several alternate timelines)
Jerry Platt was a Starfleet officer in the 24th century. His serial number was YY-804-2701 NMI.
In 2371, he was a crewmember aboard the USS Voyager. He was among the crew stranded in the Delta Quadrant, when Voyager was forcefully brought there by the Caretaker.
In an alternate timeline, his last name was read aloud by Harry Kim, in early 2372, when he reviewed the Voyager's crew manifest. (VOY: "Non Sequitur")
In 2375, his name was listed on a crew manifest. (VOY: "11:59")