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 Leah Cairns as Lt. Margaret "Racetrack" Edmondson 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 Kerry Norton as Paramedic Layne Ishay Aleks Paunovic as Marine Sgt. Fischer Chris Shields as Cpl. Venner Kurt Evans as Paramedic Howard Kim Michael Tayles as Flyboy Warren Christie as Tarn Nicholas Treeshin as Sgt. Watkins