BSG 1.06 Litmus

An investigation into a Cylon infiltration comes to focus on the relationship between Chief Galen Tyrol (above) and the Galactica copy of Boomer, who is a Cylon sleeper agent in order to weed out other sleeper agents.

This feels like the first filler episode. A Cylon human detonates a bomb and an investigation reaches the wrong conclusion.

This could all have been avoided if the Captain has installed security cameras at points around the ship when he discovered the human Cyclons.