Saul Tigh is the Executive Officer (XO) of Galactica, and repeatedly serves as acting commander in the absence of William Adama. Before his service on Galactica, he served as Adama's XO on the battlestar Valkyrie. During the Cylon occupation of New Caprica, Tigh commanded the New Caprica Resistance.
A tough but troubled man with a long history of alcoholism, Tigh has false memories of having served in the Colonial Fleet since his teenage years, seeing action in the First Cylon War. He is married to Ellen Tigh, whose death was incorrectly (though logically) presumed to have been permanent. Believing himself to be a widower, he entered a sexual relationship with Caprica Six,with whom he sired a miscarried child named Liam Tigh.