| Giana O'Neill | |
|---|---|
 O'Neill's appearance during the Fall of the Twelve Colonies in (TRS: "Miniseries, Night 1"). | |
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Name |
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| Age | |
| Colony | Caprica |
| Birth place | {{{birthplace}}} |
| Birth Name | {{{birthname}}} |
| Birth Date | {{{birthdate}}} |
| Callsign | |
| Nickname | {{{nickname}}} |
| Introduced | Miniseries |
| Death | |
| Parents | |
| Siblings | |
| Children | Jemmy |
| Marital Status | Widow of Simon O'Neill |
| Family Tree | View |
| Role | Aeronautical engineer / Deckhand, Battlestar Galactica |
| Rank | Specialist |
| Serial Number | {{{serial}}} |
| Portrayed by | Lymari Nadal |
| Giana O'Neill is a Cylon | |
| Giana O'Neill is a Final Five Cylon | |
| Giana O'Neill is a Human/Cylon Hybrid | |
| Giana O'Neill is an Original Series Cylon | |
| Related Media | |
| Photo Gallery | @ BW Media |
| Additional Information | |
 O'Neill as a deckhand aboard Galactica (TRS: "The Plan"). | |
Giana O'Neill is an aeronautical engineer employed by Sun Airways who, after winning a lottery drawing, is rescued from Caprica by Sharon "Boomer" Valerii and Karl "Helo" Agathon during the Fall of the Twelve Colonies. She enlists in the Colonial Fleet, becoming a mechanic aboard Galactica, replacing deckhands lost during the Fall.
Joining the Fleet
She is brought to Colonial One via Raptor 312, asking for her husband, and later appearing in the crowd at the service for the dead where Commander William Adama announces their destination, Earth (TRS: "Miniseries").
Her husband Simon served as a medic in the Colonial Fleet near Gemenon and was presumed dead (TRS: "Miniseries", "The Plan"). She has a daughter, Jemmy, from a previous marriage.
O'Neill enlists in the Colonial Fleet and becomes a mechanic on Galactica, putting her civilian experience as an aeronautical engineer to use. She bonds with Chief Galen Tyrol, and immediately picks up on his relationship with Valerii, stating she knows an "office romance" when she sees one. She is reunited with her husband and daughter, who managed to get off Gemenon aboard the container ship Cybele.
Unbeknownst to her, Simon is actually a Number Four Cylon. He later commits suicide when he is ordered to blow up Cybele by Brother John Cavil, choosing to die rather than hurt the ones he loved with the belief that his love for his wife would outlast his death. O'Neill is questioned regarding the incident by Colonel Tigh. During the questioning she brings up and then denies the possibility that Simon was a Cylon. Tigh assures her that no one thought he was and conveys his sympathies for her loss. After later learning from Kara Thrace that Simon was indeed a Cylon, O'Neill discusses the matter with Tyrol. She claims Simon's suicide was heroic, and she'd also kill herself if she suspected she were a Cylon too (TRS: "The Plan"). This later prompts Tyrol to ponder and attempt suicide himself following his discussions with Brother Cavil and Valerii's earlier death (TRS: "Lay Down Your Burdens, Part I").
O'Neill appears one last time as she stands in an intersection while the Cavils are being escorted to the hangar deck for their execution via a launch tube (TRS: "The Plan").