Marchetti was a human Starfleet officer serving in the operations division during the late 24th century. In the 2380s, he was assigned to the USS Pendragon, where he held a variety of posts. (Star Trek: Pendragon: "Not Home Yet", "Whispers As Loud As Thunder", "Of Shadows and Starlight", "To Face the Gathering Storm", "The Argonaut Syndrome", "The Way to Camlann", "Above the Wrecks of Time")
- Based on commentary for "The Way to Camlann," Marchetti's first name may have been Anders.