A Starfleet lieutenant serving aboard the science vessel USS Prometheus during Professor Gideon Seyetik's attempt to reignite the dead star Epsilon 119 in the episode Second Sight.
Lieutenant Piersall is a Starfleet officer seen in the second-season episode Second Sight. He serves on the USS Prometheus, the ship assigned to carry the terraformer Gideon Seyetik and his equipment to Epsilon 119, a burnt-out star that Seyetik intends to bring back to life.
Piersall mans a bridge station through the mission, with Benjamin Sisko and Jadzia Dax aboard as observers, and reports on the progress of the shuttlepod that is to deliver the ignition material into the stellar core.
When Seyetik takes the pod himself, ending his own life so that his wife Nidell may be free and his last work will be his greatest, Piersall is among the crew who watch the star flare into light.