Litmus (Battlestar Galactica)

"**Litmus**"
"Litmus"
Battlestar Galactica episode
Episode no.	Season 1; Episode 6
Directed by	Rod Hardy
Written by	Jeff Vlaming
Original air dates	November 22, 2004 (UK); February 11, 2005 (US);
Guest appearances
	Donnelly Rhodes as Doctor Cottle; Jill Teed as Sergeant Hadrian; Dominic Zamprogna as Jammer; Alonso Oyarzun as Socinus; Nicki Clyne as Cally; Matthew Bennett as Number Five;
Episode chronology
← Previous; "You Can't Go Home Again"	Next →; "Six Degrees of Separation"
	Battlestar Galactica season 1
	List of episodes

"Litmus" is the sixth episode of the reimagined Battlestar Galactica television series. In the episode, an investigation into a Cylon infiltration comes to focus on the relationship between Chief Galen Tyrol and the Galactica copy of Boomer (who is a Cylon sleeper agent) in order to weed out other sleeper agents.