Guest Stars Kate Vernon as Ellen Tigh Sam Witwer as Crashdown Co Starring Michael Hogan as Saul Tigh Aaron Douglas as Galen Tyrol Tahmoh Penikett as Karl "Helo" Agathon Alessandro Juliani as Felix Gaeta Kandyse McClure as Anastasia "Dee" Dualla Nicki Clyne as Callandra "Cally" Henderson Bodie Olmos as Lt. Brenden "Hotdog" Constanza Paul Campbell as Billy Keikeya Jennifer Halley as Ensign Diana "Hardball" Seelix Luciana Carro as Captain Louanne "Kat" Katraine Alonso Oyarzun as Specialist Socinus Ty Olsson as Captain Aaron Kelly Dominic Zamprogna as James "Jammer" Lyman Kerry Norton as Paramedic Layne Ishay Chris Shields as Cpl. Venner Michael Tayles as Flyboy Garvin Cross as Collishaw Brad Loree as Bonnington Lori Stewart as Twinam