Battlestar Galactica Season 1 Episode 9
Link 1 (sina): Battlestar Galactica Season 1 Episode 9
Original Air Date—13 December 2004
After the interrogated Cylon gave Roslin the idea that Adama might be a Cylon, Roslin becomes suspicious of him. Unexpectedly, Colonel Tigh’s estranged wife Ellen turns up alive in the fleet, apparently miraculously, raising the possibility that she might be a Cylon.
Battlestar Galactica Season 1 Episode 8
Link 1 (sina): Battlestar Galactica Season 1 Episode 8
Original Air Date—6 December 2004
A humanoid Cylon is captured in the fleet, a copy of the Leoben model, who claims that he has planted a nuclear bomb in the Fleet before he was captured. Starbuck is tasked with interrogating him, which soon becomes a battle of wills as Starbuck has her marines to torture the Cylon to try to break him.
Battlestar Galactica Season 1 Episode 7
Link 1 (sina):Battlestar Galactica Season 1 Episode 7
Original Air Date—29 November 2004
After Baltar has an argument with the vision of Number Six he sees in his head, a physical copy of Cylon model Number Six shows up in Galactica’s CIC claiming to be a woman named Shelley Godfrey who has evidence that proves that Baltar has betrayed humanity…except that she’s trying to frame him for an act of pre-attack sabotage.
Battlestar Galactica Season 1 Episode 6
Link 1 (sina):Battlestar Galactica Season 1 Episode 6
Original Air Date—22 November 2004
A humanoid Cylon straps himself with explosives and commits a suicide bombing in a crowded hallway on Galactica. Roslin and Adama are forced to publicly reveal that the Cylons now have models that look like humans, and a wave of paranoia spreads over the fleet as everyone starts being suspected of being a Cylon.

