Litmus

S1, E6: As Galactica passes another seemingly routine night, a man who we know as Doral (the Cylon model who disguised himself as a PR man) stealths his way through the ship with a block of G-4 attached to his chest. When the Cylon-turned suicide bomber finally detonates himself, the actual damage isn't as bad as it could have been (Three are dead, while Commander Adama barely missed the blast's impact thanks to Colonel Tigh's instinct), but the collateral damage will be far worse.