In the first season of the rebooted Battlestar Galactica they mentioned that they wanted to perform Cylon tests on people in sensitive positions first, and that they are going to start with Commander Adama. Given that and that

Tigh is revealed later to be a Cylon, why was he not discovered within the first week of testing?

  • 2
    Tigh is one of the "five". They are very highly advanced (even more than the Boomer/Athena/8 model) and basically indistinguishable from humans. Also, Baltar was the one performing those tests and he was lying through his teeth about their effectiveness.
    – Tim
    Sep 7, 2017 at 1:15
  • 1
    @Tim Even as one of the 5, it is later commented that One killed the Five sometime after/during the first Cylon war, so wouldn't their bodies have the same imperfections as whatever the new models (1-8) have?
    – Daishozen
    Sep 7, 2017 at 1:17
  • 2
    Also, we know the test works as it caught Boomer, but he lied so as not to have his neck broken by her...
    – Daishozen
    Sep 7, 2017 at 1:20
  • Hmm, good point. I suspect Baltar was the reason he wasn't detected.
    – Tim
    Sep 7, 2017 at 1:33
  • 8
    For that I don't have an answer. But anyone who's in a constant state of mental confusion due to an invisible sex bot probably isn't all that reliable.
    – Tim
    Sep 7, 2017 at 1:46

1 Answer 1


Because after the initial positive test of Boomer (which Baltar hides to save his neck), and Baltar later discovering that each sample will take ~11 hours to test, he fixes the cylon detector to give everyone a pass.

The functioning Cylon detector created by Baltar confirms that Sharon Valerii is indeed a Cylon, a fact that Baltar hides from Valerii, fearing what her Cylon persona would do were he to tell her (TRS: "Flesh and Bone"). After discovering that it would be easier for him to make all the results "green," Baltar alters the device to mimic this method of thinking (TRS: "Tigh Me Up, Tigh Me Down"). However, after Sharon Valerii shoots Commander Adama, everyone believes the Cylon detector to be a failure, thinking that it did not pick up her Cylon nature (TRS: "Resistance", "He That Believeth In Me").


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