"Valley of Darkness" is the second episode of the second season of the reimagined Battlestar Galactica television series. It aired originally on the Sci Fi Channel on July 22, 2005. In the episode, Cylon Centurions board Galactica. The crew, led by Lee "Apollo" Adama, beat them back but suffer heavy casualties. On Kobol, Gaius Baltar's visions continue, and Chief Galen Tyrol euthanizes a dying comrade. On Caprica, Starbuck and Helo relax in Starbuck's apartment and then take her truck out of the city.