Ensign Molina was an operations division Starfleet officer assigned to security aboard the USS Voyager under Captain Kathryn Janeway. He was one of many crewmembers that survived the transport to the Delta Quadrant in 2371.
He was assigned to watch the Nyrian astrophysicist, Dr. Rislan, while he worked with B'Elanna Torres in engineering. Molina was distracted by the warp core, and while distracted was attacked by Rislan.
Molina was later discovered unconscious by Crewman Gennaro, who was making a security sweep of the ship. They were both subsequently translocated to a Nyrian biosphere vessel, where they were temporarily held prisoner. (VOY: "Displaced")