The Galactica's executive officer is profoundly loyal to Adama — but also tightly wound, embittered and an alcoholic. He has endured unspeakable hardships during a lifetime of battling Cylons, including losing an eye to Cylon torture on New Caprica and being forced to execute his wife, Ellen, for enemy collaboration. Since humanity's escape from that world, Tigh has struggled to overcome the furious hatred and guilt he feels, and to live up to his commander and crew's trust in him. Recently, however, he felt that he was losing his grip on sanity. Then, to his horror, he discovered that he wasn't crazy — instead, a dormant program in his brain had been activated, revealing his true nature. Tigh is a Cylon, one of the mysterious Final Five.
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