Fenna was a psychoprojective telepathy projection of the unconsciousness mind of Nidell. Fenna was actually a being of pure energy, a doppelganger for Nidell. While Nidell and her husband, Gideon Seyetik, visited Deep Space 9 on the USS Prometheus in 2370, Fenna appeared on the Promenade where Benjamin Sisko noticed her and took an interest in her. After several evenings meeting with her on the Promenade, Sisko fell in love with her but became frustrated when she wouldn't tell him anything about herself or where she came from. He was surprised when he met Nidell, who appeared identical to Fenna, on the Prometheus. The next time Sisko saw Fenna he called Lt. Dax into the room. Dax immediately scanned Fenna and found no life signal, only energy. Sisko and Dax took Fenna to Gideon and it was