S1E9 · Tigh Me Up, Tigh Me Down

Complete story — includes the ending

Having completed work on the Cylon detector, Baltar begins testing the Galactica crew. Though she was presumed dead in the original Cylon attack, Colonel Saul Tigh 's wife Ellen appears in the fleet. Since Commander Adama suspects Ellen, and Roslin suspects Adama and then Ellen of being Cylons, they give Baltar conflicting orders as to who to test first, frustrating him and interrupting and delaying his work multiple times. Mutual suspicions, Adama's concerns regarding Ellen's bad influence on Saul, and Ellen's erratic accusations against Adama of sexual harassment cause a quarrel between Roslin, Adama, Saul, and Ellen. The quarrel is resolved after Saul and Adama team up to repel an attack by a Cylon Raider and Baltar completes Ellen's test and declares her human. A conversation between Six and Baltar reveals that the result may have been fake and that Baltar would declare anyone human to avoid further fuss. On Caprica, Helo and Sharon avoid capture by running through a sewer system. At Sharon's suggestion, they head to the city of Delphi where they can find a ship and escape from the planet. Six and Doral express envy of the feelings between Helo and Sharon.